import java.util.Scanner;

public class Main {

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

		StringBuffer line = new StringBuffer(sc.nextLine());
		for (int i = 0; i < line.length(); i++) {
			char ch = line.charAt(i);
			if (ch >= 'a' && ch <= 'z') {
				ch += 'A' - 'a';
				line.setCharAt(i, ch);
			} else if (ch >= 'A' && ch <= 'Z') {
				ch -= 'A' - 'a';
				line.setCharAt(i, ch);
			}
		}
		
		System.out.println(line);
		
		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