#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < (n); ++i)

int main(){
    string N;
    cin >> N;
    char max_num = '0';
    int max_ix = 0;

    for(int i=0;i<N.length();i++){
        if(max_num <= N[i]){
            max_num = N[i];
            max_ix = i;
        }
    }

    swap(N[0],N[max_ix]);
    cout << N << endl;

}