#include <stdio.h>

int main(){

	char pass[100];
	scanf("%s", pass);

	int i = 0;
	while(pass[i] != '\0'){
		if(pass[i] > 96){
			pass[i] = pass[i] - 32;
		}else{
			pass[i] = pass[i] + 32;
		}
		i++;
	}

	printf("%s\n", pass);

	return 0;

}