#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;
typedef long long ll;
typedef pair<int,int>P;

const int MOD=1000000007;
const int INF=0x3f3f3f3f;
const ll INFL=0x3f3f3f3f3f3f3f3f;

int main(){
	string s;cin>>s;
	sort(s.begin(),s.end(),greater<>());
	set<pair<char,int>>se;
	bool ok=false;
	int a;
	for(int i=s.size()-1;i>=0;i--){
		if(!se.empty()&&se.begin()->first<s[i]){
			auto it=se.lower_bound(P(s[i],0));
			it--;
			if(i==0&&it->first=='0')continue;
			a=i;
			swap(s[i],s[it->second]);
			ok=true;
			break;
		}
		se.insert(make_pair(s[i],i));
	}
	if(!ok){puts("-1");return 0;}
	sort(s.begin()+a+1,s.end(),greater<>());
	cout<<s<<endl;
}