import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();

		sc.close();

		for(int i=0; i<str.length(); i++) {
			if(Character.isUpperCase(str.charAt(i))) {
				System.out.print(str.split("")[i].toLowerCase());
			} else {
				System.out.print(str.split("")[i].toUpperCase());
			}
		}
		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