import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        try(Scanner sc = new Scanner(System.in)){
            String line = sc.nextLine();
            int length = line.length();
            char result[] = new char[length];
            for(int i=0; i<length; i++){
                char ch = line.charAt(i);
                if(Character.isLowerCase(ch) == true) result[i] = Character.toUpperCase(ch);
                else if(Character.isUpperCase(ch) == true) result[i] = Character.toLowerCase(ch);
                else result[i] = ch; 
            }
            System.out.println(result);
        }
    }
}

/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