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

int main() {
	string n;
	cin >> n;
	int m = 0;
	while (m<n.size()) {
		for (int i = m;i < n.size();i++) {
			if (n[m] <= n[i]) {
				m = i;
			}
		}
		bool b = false;
		for (int i = 0;i < m;i++) {
			if (n[i] < n[m]) {
				b = true;
			}
		}
		if (b) {
			break;
		}
		else {
			m++;
		}
	}
	if (m == n.size()) {
		cout << n << endl;
		return 0;
	}
	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;
}