#include <bits/stdc++.h>

using namespace std;

int main(){
    string x;
    cin >> x;
    int n=x.length();
    vector<int> y(n);
    for(int i=0;i<n;i++){
        int s=x[i]-'0';
        y[i]=s;
    }
    sort(y.rbegin(),y.rend());
    for(int i=2;i<n+1;i++){
        if(i==n){
            if(y[n-i+1]==0 || y[n-i]==y[n-i+1]){
                cout << -1 << endl;
                return 0;
            }
        }
        else if(y[n-i]==y[n-i+1]){
            continue;
        }
        int p=y[n-i+1];
        y[n-i+1]=y[n-i];
        y[n-i]=p;
        break;
    }
    for(int i=0;i<n;i++){
        cout << y[i];
    }
    cout << endl;
}