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

//pointer rewriting
// you can use 32 because of ASCII code

int main(void)
{
	char str[100];
	int i;
	scanf("%s", str);
    
	for (i = 0; str[i] != '\0'; i++)
	{
		if (str[i] >= 'a')
			str[i] -= 32;
		else
			str[i] += 32;
	}
	printf("%s", str);

	return 0;
}