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

int main() {
  string s;
  cin >> s;
  sort(rbegin(s), rend(s));
  if (prev_permutation(begin(s), end(s)) and s[0] != '0') {
    cout << s << '\n';
  } else {
    cout << "-1\n";
  }
}