#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


struct FastIO{
  FastIO(){
    cin.tie(0);
    ios::sync_with_stdio(0);
  }
}fastio_beet;


template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}

//INSERT ABOVE HERE
signed main(){
  string s;
  cin>>s;
  sort(s.rbegin(),s.rend());
  if(!prev_permutation(s.begin(),s.end())) drop(-1);
  if(s[0]=='0') drop(-1);
  cout<<s<<endl;
  return 0;
}