#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main(){
    string s,r;
    cin >> s;
    r = s;
    int n = s.size();
    for(int i = 0; i < n; i++){
        for(int j = i+1; j < n; j++){
            swap(s[i],s[j]);
            r = max(r,s);
            swap(s[i],s[j]);
        }
    }
    cout << r << endl;
}