#include<iostream>
#include<string>
#include<algorithm>

int main() {
	std::string s;

	std::cin >> s;

	int max = std::stoi(s);
	for (int i = 0; i < s.length(); i++) {
		for (int j = i + 1; j < s.length(); j++) {
			std::swap(s[i], s[j]);
			max = std::max(max, std::stoi(s));
			std::swap(s[i], s[j]);
		}
	}

	std::cout << max << std::endl;
	return 0;
}