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

int main(){
	string n;
	cin >> n;
	int max_num = 0, max_index = 0;
	int i;
	for(i = 0; i < n.length(); i++) {
		if(max_num <= n.at(i)) {
			max_num = n.at(i);
			max_index = i;
		}
	}
	swap(n.at(0), n.at(max_index));
	cout << n << endl;
}