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

int main()
{
    string S;
    cin >> S;
    int N = S.size();
    sort(S.rbegin(), S.rend());
    for (int i = N - 1; i >= 1; i--)
    {
        if (S[i] != S[i - 1])
        {
            swap(S[i], S[i - 1]);
            if (S[0] != '0')
            {
                cout << S;
                return 0;
            }
            else
            {
                cout << -1;
                return 0;
            }
        }
    }
    cout << -1;
    return 0;
}