#include <iostream>
#include <string>
using namespace std;
int main(){
	string N;
	cin >> N;
	int K = N.size();
	string ans = N;
	for (int i = 0; i < K; i++){
		for (int j = i + 1; j < K; j++){
			string N2 = N;
			swap(N2[i], N2[j]);
			ans = max(ans, N2);
		}
	}
	cout << ans << endl;
}