// Author: Yang Dong
#include <bits/stdc++.h>
using namespace std;
int a, b;  // a pos, b neg
vector<int> check(int x) {
      vector<int> ret, val(x + 1);
      vector<array<int, 2>> in(x + 1, { -1, -1 }), out(x + 1, { -1, -1 });
      int cloc = 0;
      queue<int> q;
      for (int i = 0; i <= x; ++i) {
            if (i + b <= x) out[i + b][0] = i, in[i][0] = i + b;
            if (i - a >= 0)  out[i - a][1] = i, in[i][1] = i - a;
            if (in[i][0] == -1 && in[i][1] == -1) q.push(i);
         
    }
      while (!q.empty()) {
            int u = q.front(), v;
        q.pop();
            val[u] = ++cloc;
            if (out[u][0] != -1) {
                  v = out[u][0];
                  in[u][0] = out[u][0] = -1;
                  if (in[v][1] == -1) q.push(v);
               
        }
            if (out[u][1] != -1) {
                  v = out[u][1];
                  in[v][1] = out[u][1] = -1;
                  if (in[v][0] == -1) q.push(v);
               
        }
         
    }
      if (cloc != x + 1) return {};
      for (int i = 1; i <= x; ++i)
    ret.push_back(val[i] - val[i - 1]);
      return ret;
}
int main() {
      cin >> a >> b;
      int l = 0, r = 1000000;
      while (l < r) {
            int mid = (l + r) >> 1;
            if (l == r - 1) mid = r;
            if (check(mid).size()) l = mid;
            else r = mid - 1;
         
    }
      auto z = check(l);
      printf("%d\n", l);
      for (auto g : z) printf("%d ", g);
      return 0;
}

/sandbox/1/a.cpp:6:1: error: extended character   is not valid in an identifier
    6 | �� vector<int> ret, val(x + 1);
      | ^
/sandbox/1/a.cpp:6:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:7:1: error: extended character   is not valid in an identifier
    7 | �� vector<array<int,2>> in(x + 1, {-1, -1}), out(x + 1, {-1, -1});
      | ^
/sandbox/1/a.cpp:7:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:8:1: error: extended character   is not valid in an identifier
    8 | �� int cloc = 0;
      | ^
/sandbox/1/a.cpp:8:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:9:1: error: extended character   is not valid in an identifier
    9 | �� queue<int> q;
      | ^
/sandbox/1/a.cpp:9:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:10:1: error: extended character   is not valid in an identifier
   10 | �� for(int i = 0; i <= x; ++i) {
      | ^
/sandbox/1/a.cpp:10:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:11:1: error: extended character   is not valid in an identifier
   11 | ��   if(i + b <= x) out[i + b][0] = i, in[i][0] = i + b;
      | ^
/sandbox/1/a.cpp:11:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:11:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:11:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:12:1: error: extended character   is not valid in an identifier
   12 | ��   if(i - a >= 0)  out[i - a][1] = i, in[i][1] = i - a;
      | ^
/sandbox/1/a.cpp:12:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:12:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:12:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:12:24: error: extended character   is not valid in an identifier
   12 |     if(i - a >= 0) ��out[i - a][1] = i, in[i][1] = i - a;
      |                    ^
/sandbox/1/a.cpp:13:1: error: extended character   is not valid in an identifier
   13 | ��   if(in[i][0] == -1 && in[i][1] == -1) q.push(i);
      | ^
/sandbox/1/a.cpp:13:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:13:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:13:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:14:1: error: extended character   is not valid in an identifier
   14 | ��}
      | ^
/sandbox/1/a.cpp:15:1: error: extended character   is not valid in an identifier
   15 | �� while(!q.empty()) {
      | ^
/sandbox/1/a.cpp:15:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:16:1: error: extended character   is not valid in an identifier
   16 | ��   int u = q.front(), v; q.pop();
      | ^
/sandbox/1/a.cpp:16:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:16:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:16:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:17:1: error: extended character   is not valid in an identifier
   17 | ��   val[u] = ++cloc;
      | ^
/sandbox/1/a.cpp:17:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:17:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:17:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:18:1: error: extended character   is not valid in an identifier
   18 | ��   if(out[u][0] != -1) {
      | ^
/sandbox/1/a.cpp:18:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:18:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:18:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
   19 | ��     v = out[u][0];
      | ^
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:19:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
   20 | ��     in[u][0] = out[u][0] = -1;
      | ^
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:20:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
   21 | ��     if(in[v][1] == -1) q.push(v);
      | ^
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:21:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:22:1: error: extended character   is not valid in an identifier
   22 | ��  }
      | ^
/sandbox/1/a.cpp:22:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:22:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:23:1: error: extended character   is not valid in an identifier
   23 | ��   if(out[u][1] != -1) {
      | ^
/sandbox/1/a.cpp:23:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:23:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:23:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
   24 | ��     v = out[u][1];
      | ^
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:24:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
   25 | ��     in[v][1] = out[u][1] = -1;
      | ^
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:25:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
   26 | ��     if(in[v][0] == -1) q.push(v);
      | ^
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:26:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:27:1: error: extended character   is not valid in an identifier
   27 | ��  }
      | ^
/sandbox/1/a.cpp:27:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:27:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:28:1: error: extended character   is not valid in an identifier
   28 | ��}
      | ^
/sandbox/1/a.cpp:29:1: error: extended character   is not valid in an identifier
   29 | �� if(cloc != x + 1) return {};
      | ^
/sandbox/1/a.cpp:29:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:30:1: error: extended character   is not valid in an identifier
   30 | �� for(int i = 1; i <= x; ++i)
      | ^
/sandbox/1/a.cpp:30:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:31:1: error: extended character   is not valid in an identifier
   31 | ��   ret.push_back(val[i] - val[i - 1]);
      | ^
/sandbox/1/a.cpp:31:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:31:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:31:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:32:1: error: extended character   is not valid in an identifier
   32 | �� return ret;
      | ^
/sandbox/1/a.cpp:32:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:35:1: error: extended character   is not valid in an identifier
   35 | �� cin >> a >> b;
      | ^
/sandbox/1/a.cpp:35:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:36:1: error: extended character   is not valid in an identifier
   36 | �� int l = 0, r = 1000000;
      | ^
/sandbox/1/a.cpp:36:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:37:1: error: extended character   is not valid in an identifier
   37 | �� while(l < r) {
      | ^
/sandbox/1/a.cpp:37:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:38:1: error: extended character   is not valid in an identifier
   38 | ��   int mid = (l + r) >> 1;
      | ^
/sandbox/1/a.cpp:38:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:38:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:38:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:39:1: error: extended character   is not valid in an identifier
   39 | ��   if(l == r - 1) mid = r;
      | ^
/sandbox/1/a.cpp:39:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:39:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:39:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:40:1: error: extended character   is not valid in an identifier
   40 | ��   if(check(mid).size()) l = mid;
      | ^
/sandbox/1/a.cpp:40:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:40:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:40:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:41:1: error: extended character   is not valid in an identifier
   41 | ��   else r = mid - 1;
      | ^
/sandbox/1/a.cpp:41:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:41:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:41:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:42:1: error: extended character   is not valid in an identifier
   42 | ��}
      | ^
/sandbox/1/a.cpp:43:1: error: extended character   is not valid in an identifier
   43 | �� auto z = check(l);
      | ^
/sandbox/1/a.cpp:43:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:44:1: error: extended character   is not valid in an identifier
   44 | �� printf("%d\n", l);
      | ^
/sandbox/1/a.cpp:44:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:45:1: error: extended character   is not valid in an identifier
   45 | �� for(auto g : z) printf("%d ", g);
      | ^
/sandbox/1/a.cpp:45:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp:46:1: error: extended character   is not valid in an identifier
   46 | �� return 0;
      | ^
/sandbox/1/a.cpp:46:1: error: extended character   is not valid in an identifier
/sandbox/1/a.cpp: In function 'std::vector<int> check(int)':
/sandbox/1/a.cpp:6:1: error: '\U000000a0\U000000a0vector' was not declared in this scope
    6 |   vector<int> ret, val(x + 1);
      | ^~~~~~~~
/sandbox/1/a.cpp:6:12: error: expected primary-expression before 'int'
    6 |   vector<int> ret, val(x + 1);
      |          ^~~
/sandbox/1/a.cpp:7:12: error: 'array' was not declared in this scope
    7 |   vector<array<int,2>> in(x + 1, {-1, -1}), out(x + 1, {-1, -1});
      |          ^~~~~
/sandbox/1/a.cpp:7:12: note: 'std::array' is only available from C++11 onwards
/sandbox/1/a.cpp:7:18: error: expected primary-expression before 'int'
    7 |   vector<array<int,2>> in(x + 1, {-1, -1}), out(x + 1, {-1, -1});
      |                ^~~
/sandbox/1/a.cpp:7:44: error: expected primary-expression before ')' token
    7 |   vector<array<int,2>> in(x + 1, {-1, -1}), out(x + 1, {-1, -1});
      |                                          ^
/sandbox/1/a.cpp:7:66: error: expected primary-expression before ')' token
    7 |   vector<array<int,2>> in(x + 1, {-1, -1}), out(x + 1, {-1, -1});
      |                                                                ^
/sandbox/1/a.cpp:8:1: error: '\U000000a0\U000000a0int' was not declared in this scope
    8 |   int cloc = 0;
      | ^~~~~
/sandbox/1/a.cpp:9:1: error: '\U000000a0\U000000a0queue' was not declared in this scope
    9 |   queue<int> q;
      | ^~~~~~~
/sandbox/1/a.cpp:9:11: error: expected primary-expression before 'int'
    9 |   queue<int> q;
      |         ^~~
/sandbox/1/a.cpp:10:9: error: expected primary-expression before 'int'
   10 |   for(int i = 0; i <= x; ++i) {
      |       ^~~
/sandbox/1/a.cpp:10:20: error: 'i' was not declared in this scope
   10 |   for(int i = 0; i <= x; ++i) {
      |                  ^
/sandbox/1/a.cpp:15:12: error: 'q' was not declared in this scope
   15 |   while(!q.empty()) {
      |          ^
/sandbox/1/a.cpp:15:1: error: '\U000000a0\U000000a0while' was not declared in this scope
   15 |   while(!q.empty()) {
      | ^~~~~~~
/sandbox/1/a.cpp:29:8: error: 'cloc' was not declared in this scope; did you mean 'clock'?
   29 |   if(cloc != x + 1) return {};
      |      ^~~~
      |      clock
/sandbox/1/a.cpp:29:1: error: '\U000000a0\U000000a0if' was not declared in this scope
   29 |   if(cloc != x + 1) return {};
      | ^~~~
/sandbox/1/a.cpp:30:9: error: expected primary-expression before 'int'
   30 |   for(int i = 1; i <= x; ++i)
      |       ^~~
/sandbox/1/a.cpp:32:1: error: '\U000000a0\U000000a0return' was not declared in this scope
   32 |   return ret;
      | ^~~~~~~~
/sandbox/1/a.cpp:33:1: warning: no return statement in function returning non-void [-Wreturn-type]
   33 | }
      | ^
/sandbox/1/a.cpp: In function 'int main()':
/sandbox/1/a.cpp:35:1: error: '\U000000a0\U000000a0cin' was not declared in this scope
   35 |   cin >> a >> b;
      | ^~~~~
/sandbox/1/a.cpp:36:1: error: '\U000000a0\U000000a0int' was not declared in this scope
   36 |   int l = 0, r = 1000000;
      | ^~~~~
/sandbox/1/a.cpp:37:11: error: 'l' was not declared in this scope
   37 |   while(l < r) {
      |         ^
/sandbox/1/a.cpp:37:15: error: 'r' was not declared in this scope
   37 |   while(l < r) {
      |             ^
/sandbox/1/a.cpp:37:1: error: '\U000000a0\U000000a0while' was not declared in this scope
   37 |   while(l < r) {
      | ^~~~~~~
/sandbox/1/a.cpp:43:1: error: '\U000000a0\U000000a0auto' was not declared in this scope
   43 |   auto z = check(l);
      | ^~~~~~
/sandbox/1/a.cpp:44:1: error: '\U000000a0\U000000a0printf' was not declared in this scope
   44 |   printf("%d\n", l);
      | ^~~~~~~~
/sandbox/1/a.cpp:45:8: warning: C++11 auto only available with '-std=c++11' or '-std=gnu++11'
   45 |   for(auto g : z) printf("%d ", g);
      |      ^
/sandbox/1/a.cpp:45:9: error: expected primary-expression before 'auto'
   45 |   for(auto g : z) printf("%d ", g);
      |       ^~~~
/sandbox/1/a.cpp:45:1: error: '\U000000a0\U000000a0for' was not declared in this scope
   45 |   for(auto g : z) printf("%d ", g);
      | ^~~~~
/sandbox/1/a.cpp:46:1: error: '\U000000a0\U000000a0return' was not declared in this scope
   46 |   return 0;
      | ^~~~~~~~