class LetterList:
	def __init__(self, n): self.n = n
	def __len__(self): return self.n
	def __getitem__(self, i): return chr(ord('A') + i)
	def __iter__(self):
		for i in range(self.n):
			yield self[i]

for letter in LetterList(3):
	print(letter, end=" ")