import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
			String str=scan.nextLine();
			char c[] =str.toCharArray();
			for(int i=0;i<str.length();i++) {
				if(Character.isLowerCase(c[i])) {
					c[i] =Character.toUpperCase(c[i]);
				}else{
					c[i] =Character.toLowerCase(c[i]);
				}
				System.out.print(c[i]);
			}
			
		System.out.printf("\n");
		scan.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