#include <stdio.h>
#include <string.h>

int main(void) {
	char c;
	while(scanf("%c", &c) != EOF){
		if(c == '\n') break;
		if(c >= 'a' && c <= 'z') printf("%c", c + ('A' - 'a'));
		else printf("%c", c + ('a' - 'A'));
	}
	return 0;
}