#include <stdio.h>

int main(void) {
	char s[101];
	int i;
	scanf("%s", s);
	//printf("%s\n", s);
	i = 0;
	while(s[i] != '\0'){
		if('a' <= s[i] && s[i] <= 'z')printf("%c", s[i] - 32);
		else printf("%c", s[i] + 32);
		i++;
	}
	printf("\n");
	
	return 0;
}