#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;
    int idx = 0;
    rep(i,s.size()){
        if(s[i] >= s[idx]) idx = i;
    }
    swap(s[idx],s[0]);
    cout << s << endl;
    return 0;
}