#include <iostream>
#include <algorithm>
#include <string.h>
using namespace std;
char a[100001], b[100001];
int main() {
    int i = 1;
    while (cin >> a[i]) {
        if (a[i] == '\n')
            break;
        i++;
    }

    sort(a + 1, a + i);
    int j, k;
    k = 1;
    for (j = 1; j < i; j++) {
        if (a[j] < 'a' && a[j] > '9') {
            b[k] = a[j], k++;
            continue;
        } else
            cout << a[j];
    }
    for (i = 1; i < k; i++) {
        cout << b[i];
    }
}

/sandbox/1/a.c:1:10: fatal error: 'iostream' file not found
#include <iostream>
         ^~~~~~~~~~
1 error generated.