import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner scan = null;
		try{
			scan = new Scanner(System.in);
			char[] str = scan.nextLine().toCharArray();
			for(int i = 0; i < str.length;i++){
				if(Character.isLowerCase(str[i])){
					System.out.print(Character.toUpperCase(str[i]));
				}else if(Character.isUpperCase(str[i])){
					System.out.print(Character.toLowerCase(str[i]));
				}else
					System.out.print(str[i]);
			}
			System.out.println();
		}finally{
			if(scan !=null)scan.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