#include<bits/stdc++.h>
using namespace std;
#define rep(i,x,y) for(int i=x;i<y;i++)
#define range(a) (a).begin(),(a).end()
#define print(A,n) rep(i,0,n){cout<<(i ? " ":"")<<A[i];}cout<<endl;
#define pprint(A,m,n) rep(j,0,m){print(A[j],n);}
const long mod=1e9+7;
const int size=1e5;
const long inf=1e9;
int main(){
	string X;cin>>X;
	deque<int> v;
	rep(i,0,X.size()){
		v.push_back((int)X[i]-48);
	}sort(v.begin(),v.end(),greater<int>());
	for(int i=v.size()-1;i>=0;i--){
		if(v[i]>v.back()){
            if(i==0&&v.back()==0){ cout<<-1<<endl; return 0; }
			swap(v[i],v[i+1]);
			for(int u:v) cout<<u;
			cout<<endl;
            return 0;
		}
	}cout<<-1<<endl;
}