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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>
#define LP pair<ll, ll>


int main() {
  string x;
  cin >> x;
  sort(x.begin(), x.end());
  reverse(x.begin(), x.end());
  for (int i = x.size()-1; i >= 1; i--) {
    if (x[i] != x[i-1]) {
      if (i-1>0 || x[i] != '0') {
        swap(x[i],x[i-1]);
        cout << x << endl;
        return 0;
      }
    }
  }
  cout << -1 << endl;

}