#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);

	char tmp;
	std::vector<int> input;
	while (std::cin >> tmp) {
		input.push_back(tmp-'0');
	}
	std::vector<int> max_checker(input);
	std::sort(max_checker.begin(), max_checker.end());
	std::reverse(max_checker.begin(), max_checker.end());
	for (std::vector<int>::reverse_iterator it = input.rbegin(); it != input.rend(); ++it) {
		if (*it == max_checker[0]) {
			for (std::vector<int>::iterator it2 = input.begin(); it2 != input.end(); ++it2) {
				if (*it2 != max_checker[0]) {
					std::swap(*it, *it2);
					goto OUTPUT;
				}
			}
		}
	}
		OUTPUT:
	for (auto it : input) {
		std::cout << it;
	}
	std::cout << "\n";

	return 0;
}