import java.util.Scanner;

public class Main {
	void run() {
		Scanner scan = new Scanner(System.in);
		String str = scan.nextLine();
		String[] strarray = str.split(" ");
		for(int i = 0; i < strarray.length; i++) {
			char[] carray = strarray[i].toCharArray();
			for (char c : carray) {
				if (Character.isUpperCase(c)) {
					c = Character.toLowerCase(c);
				} else if (Character.isLowerCase(c)) {
					c = Character.toUpperCase(c);
				}
				System.out.print(c);
			}
			if (i != strarray.length - 1)System.out.print(" ");
		}
		System.out.println();
	}
	public static void main(String[] args) {
		new Main().run();
	}
}
/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