#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000

int main(){
	
	string S;
	cin>>S;
	
	sort(S.begin(),S.end(),greater<char>());
	//cout<<S<<endl;
	if(!prev_permutation(S.begin(),S.end())){
		cout<<-1<<endl;
	}
	else{
		if(S[0]=='0')cout<<-1<<endl;
		else cout<<S<<endl;
	}
	
	return 0;
	
}