public class Main {
	public static void main(String[] args){
		java.util.Scanner scan = new java.util.Scanner(System.in);
		String str = scan.nextLine();
		for(int i = 0; i < str.length();i++){
			char arr = str.charAt(i);
			if(Character.isLowerCase(arr)){
				System.out.print(Character.toUpperCase(arr));
				}else{
					System.out.print(Character.toLowerCase(arr));
				}
		}
		System.out.println();
	}

}
/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