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

int main(){
    string s;
    cin >> s;
    int n = s.length();
    sort(s.begin(), s.end());
    bool jdg = false;
    for (int i = 0; i < n-1; i++) {
        if (s[i] != s[i+1] && s[i] != '0' && s[i+1] != '0') {
            jdg = true;
        }
    }

    if (jdg) {
        for (int i = 1; i < n; i++) {
            if (s[i] != '0') {
                swap(s[i], s[i-1]);
                break;
            }
        }
        reverse(s.begin(), s.end());
    }
    cout << ((jdg) ? s : "-1") << endl;
    return 0;
}