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

signed main(){
  string s;
  cin>>s;
  int len=s.length();
  vector<int>vec;
  rep(i,len){
    vec.push_back(s[i]-'0');
  }
  sort(vec.begin(),vec.end(),greater<int>());
  if(!prev_permutation(vec.begin(),vec.end())){
    cout<<-1<<endl;
    return 0;
  }
  if(vec[0]==0){
    cout<<-1<<endl;
    return 0;
  }  
  rep(i,len){
    cout<<vec[i];
  }
  cout<<endl;
  return 0;
}