//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int siz(string s){
  return (int)s.size();
}

int main(){
  string S; cin >> S;
  int s = (int)S.size();
  int nZ = 0;

  sort(S.rbegin(), S.rend());
  for(int i = 0; i < s; i++){
    int j = S[i]-'0';

    if(j != 0) nZ++;
  }

  if(S[0] == S[s-1] or nZ == 1){
    printl(-1);
  }else{
    for(int i = s-2; i >= 0; i--){
      if(S[i] != S[s-1]){
        swap(S[i], S[i+1]);

        printl(S);

        return 0;
      }
    }
  }
}