import java.io.*;

class Main{
	public static void main(String[] args){
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			String str = br.readLine();
			char c;
			for( int i=0; i<str.length(); i++ ){
				c = str.charAt(i);
				if( Character.isUpperCase(c) ) c = Character.toLowerCase(c);
				else if( Character.isLowerCase(c) ) c = Character.toUpperCase(c);
				System.out.print(c);
			}
			System.out.println();
		} catch(IOException e){
			System.out.println("Exception :" + e);
		}
	}
}
/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