import java.util.Scanner;

import static java.lang.Character.*;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        String input = sc.nextLine();

        char[] output = new char[input.length()];

        for(int i = 0; i < input.length(); i++){
            if(isLowerCase(input.charAt(i)))
                output[i] = toUpperCase(input.charAt(i));
            else if(isUpperCase(input.charAt(i)))
                output[i] = toLowerCase(input.charAt(i));
            else output[i] = input.charAt(i);
        }

        System.out.println(output);

        sc.close();
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz