#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 1e5 + 5;
bool cmp(char a, char b) {
    if (a <= 90 && a >= 65 && b >= 97 && b <= 122)
        return a > b;
    else
        return a < b;
}
char a[N];
int main() {
    gets(a);
    int len = strlen(a);
    sort(a, a + len, cmp);
    for (int i = 0; i < len; i++) cout << a[i];
    return 0;
}

/sandbox/1/a.cpp: In function 'int main()':
/sandbox/1/a.cpp:15:2: error: 'gets' was not declared in this scope
  gets(a);
  ^~~~
/sandbox/1/a.cpp:15:2: note: suggested alternative: 'getpt'
  gets(a);
  ^~~~
  getpt