#include<bits/stdc++.h>
#include<iostream>
#include<stdio.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); ++i)
typedef long long ll;
#define rALL(a) (a).rbegin(),(a).rend()



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