#include <bits/stdc++.h>
using namespace std;

int main() {
	string n;
	cin >> n;
	int m = 0;
	for (int i = 0;i < n.size();i++) {
		if (n[m] <= n[i]) {
			m = i;
		}
	}
	int left=0;
	for (int i = 0;i < n.size();i++) {
		if (n[i] < n[m]) {
			left = i;
			break;
		}
	}
	char copy = n[m];
	n[m] = n[left];
	n[left] = copy;
	cout << n << endl;
	return 0;
}