#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  sort(s.rbegin(), s.rend());
  if (!prev_permutation(s.begin(), s.end()) || s[0] == '0') {
    cout << -1 << endl;
  }
  else {
    cout << s << endl;
  }
  return 0;
}