#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]) {
			std::swap(input[0], *it);
			break;
		}
	}
	for (auto it : input) {
		std::cout << it;
	}
	std::cout << "\n";

	return 0;
}