#include <bits/stdc++.h>
using namespace std;

int cnt[10];

int main() {
    char c;
    while(cin >> c && c != '.') {
        if (c == '.') break;
        cnt[c - '0']++;
    }

    bool q = 0;
    int x = -1;
    for (int i = 0; i < 10; i++) {
        if (cnt[i]%2 == 1) {
            if (!q) {
                q = 1;
                x = i;
            }
            else {
                cout << "NO" << endl;
                return 0;
            }
        }
    }

    cout << "YES" << endl:
    string s = "";
    for (int i = 0; i < 10; i++) {
        for (int j = 0; j < cnt[i]/2; j++) {
            s += (char) (i + '0');
        }
    }

    cout << s;
    reverse(s.begin(), s.end());
    if (q) cout << x;
    cout << s;

    return 0;
}