public class Rechtschreibschwaeche extends MiniJava {

    public static void main(String[] args) {
        String input = readString();
        String output = "";

        int delta = 'a' - 'A';

        for (int i = 0; i < input.length(); ++i) {
            char c = input.charAt(i);

            if (c >= 'a' && c <= 'z') {
                output += (char) (c - delta);
            } else if (c >= 'A' && c <= 'Z') {
                output += (char) (c + delta);
            } else {
                output += c;
            }
        }

        write(output);
    }
}