import java.util.Scanner;

public class Main {

	private static Scanner sc;

	public static void main(String[] args){
		sc = new Scanner(System.in);
		String line = sc.nextLine();
		for(int i=0;i<line.length();i++){
			if(Character.isLowerCase(line.charAt(i))){
				System.out.print(Character.toUpperCase(line.charAt(i)));
			}else System.out.print(Character.toLowerCase(line.charAt(i)));
		}
		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