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

int main(){
    string s;
    cin >> s;
    int n = s.length();
    set<char> c;
    for (char ss : s) {
        if (ss != '0') c.insert(ss);
    }
    sort(s.begin(), s.end());

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