
import java.util.*;
import java.io.*;

public class Main {
	public static void main(String[] args)
	{
		Scanner stdIn = new Scanner(System.in);
		
		int x;
		
		try{
			do{
				x = System.in.read();
				if(Character.isLowerCase((char)x))
				{
					System.out.print(Character.toUpperCase((char)x));
				}
				else
				{
					System.out.print(Character.toLowerCase((char)x));
				}
			}while((char)x!='\n');
			
		}catch(IOException e){
			e.printStackTrace();
		}
	}
}
/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