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class Link (object):
	
	def __init__(self, first=None, rest=None):
		self.first = first
		self.rest = rest
	def get_data(self):
		return self.first
	def get_next(self):
		return self.rest
	def __getitem__(self, i):
		if i ==  0:
			return self.first
		get = self
		while i > 0:
			get = get.rest
			i -= 1
		if get == None:
			raise IndexError('The Sentence Index is Out of Range.')
		return get.first
		
class Circular_Link (object):
	
	def __init__(self, things):
		assert len(things) > 2
		last = Link(things[len(things)-1])
		first = Link(things[len(things)-2], last)
		index = len(things)-2
		while index > 0:
			index -= 1
			first = Link(things[index], first)
		last.rest = first
		self.circle = first
	def __getitem__(self, i):
		return self.circle[i]