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

int main() {
  string s;
  cin >> s;
  sort(s.begin(), s.end(), greater<>());
  string t = s;
  prev_permutation(t.begin(), t.end());
  if (t[0] == '0' || s == t) {
    cout << "-1\n";
  }
  else {
    cout << t << '\n';
  }
  return 0;
}