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

int main(void)
{
	char s[100];

	fgets(s, 100, stdin);
	for (size_t i = 0; i < strlen(s); ++i)
		if (s[i] > 64 && s[i] <= 90)
			s[i] ^= 32;
	printf(s);
	exit(0);
}