#include<bits/stdc++.h>
using namespace std;
#define ALL(x) x.begin(),x.end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define debug(v) cout<<#v<<":";for(auto x:v){cout<<x<<' ';}cout<<endl;
#define INF 1000000000
#define mod 1000000007
using ll=long long;
const ll LINF=1001002003004005006ll;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
template<class T>bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>bool chmin(T &a,const T &b){if(b<a){a=b;return true;}return false;}

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    string s;cin>>s;
    sort(ALL(s));
    reverse(ALL(s));
    int cnt=0,k=0;
    do{
        k++;
        if(s[0]!='0'){
            cnt++;
            if(cnt==2){
                cout<<s<<endl;
                return 0;
            }
        }
    }while(prev_permutation(ALL(s)) and k<10000);
    cout<<-1<<endl;
    return 0;
}