#include <bits/stdc++.h>
using namespace std;
typedef  long long int ll;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    string s;
    cin >> s;
    
    int t = s[0]-'0', pos = 0;
    for (int i = 1; i < s.size(); i++) {
        if (s[i]-'0' >= t) {
            t = s[i] -'0';
            pos = i;
        }
    }
    swap(s[0], s[pos]);

    cout << s << endl;
    
    
    return 0;
}