import java.util.Scanner;

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


/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