#include<stdio.h>

int main() {
	char password[100];
	int diff = 'A' - 'a';

	scanf("%s", password);

	for (int i = 0; ('a' <= password[i] && 'z' >= password[i]) || ('A' <= password[i] && 'Z' >= password[i]); i++) {
		if ('a' <= password[i] && 'z' >= password[i])
			password[i] += diff;
		else
			password[i] -= diff;
	}

	printf("%s", password);

	return 0;
}