#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<int,int> ;
const ll INF = 1e14;
const int MOD = 1000000007;

int main(){
    string s;
    cin >> s;
    rep(k,s.size()){
        int idx = k;
        for(int i=k+1;i<s.size();i++){
            if((s[i] > s[idx] && idx==k)||(s[i] >= s[idx] && idx!=k)) idx = i;
        }
        if(idx != k){
            swap(s[idx],s[k]);
            break;
        }
    }
    
    cout << s << endl;
    return 0;
}