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

int main() {
	string N; cin >> N;
	int diff = 0, tmp = 0;
	for (int i = 0; i < N.length() - 1;i++) {
		for (int j = i + 1; j < N.length();j++) {
			if (N[j] - N[i] >= diff) {
				diff = N[j] - N[i];
				tmp = j;
			}
		}
		if (diff != 0) {
			swap(N[i], N[tmp]);
			cout << N << endl;
			return 0;
		}
	}
	cout << N << endl;
	return 0;
}