import java.util.Scanner;

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