def check_input(user_input):
	"""
	Check if input is meet the input requirements: 4 alphabet spacing with blank
	:param user_input: str, can be anything
	:return: bool, whether input passed the check
	"""
	if len(user_input) != 7:
		return False
	for i in (0, 2, 4, 6):
		if not user_input[i].isalpha():
			return False
	for i in (1, 3, 5):
		if user_input[i] != ' ':
			return False
	else:
		return True