import java.util.Scanner;

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