#include <iostream>
#include <string>

int main() {
    std::string s;
    std::cin >> s;

    for(int i = 0; i < s.length(); i++) {
        if('a' <= s[i] && s[i] <= 'z') {
            std::cout << (char)(s[i] - 32);
        } else {
            std::cout << (char)(s[i] + 32);
        }
    }
    std::cout << std::endl;
}