#include <bits/stdc++.h>
using namespace std;

int main() {
	string x;
	cin >> x;
	sort(x.begin(),x.end());
	reverse(x.begin(),x.end());
	if(x[1]=='0'){
		cout << -1 << endl;
	}else{
		for(int i=x.size()-1; i>0; i--){
			if(x[i]!=x[i-1]){
				swap(x[i],x[i-1]);
				cout << x << endl; return 0;
			}
		}
		cout << -1 << endl;
	}
	return 0;
}