#include <stdio.h>

int main(void)
{
	char s[101],i;
	scanf("%s",s);
	
	for (i=0;i<101;i++) {
		if (s[i]=='\0') break;
		if (s[i]>=97) s[i] -= 32;
		else          s[i] += 32;
	}

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

	return 0;
}