#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  string s;
  cin >> s;
  int cnt[10] = {};
  for (char c : s) cnt[c - '0']++;
  string t;
  for (int i = 9; i >= 0; i--) for (int j = 0; j < cnt[i]; j++) t += i + '0';
  if (prev_permutation(t.begin(), t.end())) {
    if (t[0] == '0') {
      cout << -1 << '\n';
    } else {
      cout << t << '\n';
    }
  } else {
    cout << -1 << '\n';
  }
  return 0;
}