def not_all_alpha(r):
	"""
	:param r: (str) User's input
	:return: (bool) Whether user's input are all letters and no punctuation marks
	"""
	a = 0
	for ch in [r[0], r[2], r[4], r[6]]:
		if not ch.isalpha():
			a += 1
	if a > 0:
		return True