#include <bits/stdc++.h>

using namespace std;

int main() {
  string s;
  cin >> s;
  int n = s.size();
  sort(s.rbegin(), s.rend());
  if (n == 1 || s[1] == '0') {
    cout << -1 << endl;
    return 0;
  }
  bool flag = true;
  for (int i = 0; i < n; i++) {
    if (s[i] == 0) {
      swap(s[i], s[i - 1]);
      flag = false;
      break;
    }
    if (i < n - 1) {
      if (s[i] != s[i + 1]) flag = false;
    }
    if (i == n - 1) {
      swap(s[i], s[i - 1]);
    }
  }
  if (flag) {
    cout << -1 << endl;
  } else {
    cout << s << endl;
  }

  return 0;
}