import java.util.*;

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