#include <stdio.h>
#include <stdlib.h>

int main(void){
	int i;
	unsigned char str[101];
	unsigned char sub;

	memset(str, 0, sizeof(str));
	scanf("%s", str);

	sub = 'a' -'A';
	for(i=0; str[i] != '\0' && i < 100; i++){
		if(str[i] >= 'a')
			str[i] = str[i] - sub;
		else
			str[i] = str[i] + sub;
	}

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

	return 0;
}