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=" ")
Y2xhc3MgTGV0dGVyTGlzdDoKCWRlZiBfX2luaXRfXyhzZWxmLCBuKTogc2VsZi5uID0gbgoJZGVmIF9fbGVuX18oc2VsZik6IHJldHVybiBzZWxmLm4KCWRlZiBfX2dldGl0ZW1fXyhzZWxmLCBpKTogcmV0dXJuIGNocihvcmQoJ0EnKSArIGkpCglkZWYgX19pdGVyX18oc2VsZik6CgkJZm9yIGkgaW4gcmFuZ2Uoc2VsZi5uKToKCQkJeWllbGQgc2VsZltpXQoKZm9yIGxldHRlciBpbiBMZXR0ZXJMaXN0KDMpOgoJcHJpbnQobGV0dGVyLCBlbmQ9IiAiKQ==