#include <bits/stdc++.h>
using namespace std;
string s;
int main() {
	cin >> s;
	for(int i = 9; i > s[0] - 48; i--) {
		bool ok = false;
		for(int j = 1; j < s.size(); j++) {
			if(s[j] - 48 == i) {
				swap(s[0], s[j]);
				ok = true;
				break;
			}
		}
		if(ok) break;
	}
	cout << s << endl;
	return 0;
}