#include <iostream>
#include <vector>
#include <set>
using namespace std;
using ll = long long;
template<class T> using vec = vector<T>;
template<class T> using vvec = vector<vec<T>>;

int main(){
    string S;
    cin >> S;
    int N = S.size();
    vector<int> cnt(10);
    set<int> s;
    for(int i=0;i<N;i++){
        cnt[S[i]-'0']++;
        s.insert(S[i]-'0');
    }
    if(s.size()==1 || cnt[0]==N-1){
        cout << -1 << endl;
        return 0;
    }
    string ma = "";
    for(int i=9;i>=0;i--) for(int j=0;j<cnt[i];j++) ma += to_string(i);
    string ans = ma;
    for(int i=N-1;i>=0;i--){
        if(ans[i]!=ans[i-1]){
            swap(ans[i-1],ans[i]);
            break;
        }
    }
    cout << ans << endl;
}