#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=998244353;
int main(){
	string x;
	cin>>x;
	sort(x.begin(),x.end(),greater<>());
	if(prev_permutation(x.begin(),x.end()))
		cout<<(x[0]=='0'?"-1":x)<<endl;
	else
		cout<<-1<<endl;
}