Goodman1

def isKey(plainDict, key):
	try:
		plainDict[key]
		return True
	except KeyError:
		return False

def main():
	wordsAmount = {}
	with open('input.txt') as f:
		lines = [lines.split(" ") for lines in f.read().strip().split("\n")]
		for line in lines:
			for word in line:
				if not isKey(wordsAmount, word):
					wordsAmount.update({word : 1})
				else:
					wordsAmount[word] += 1
	print(max(wordsAmount))


if __name__ == '__main__':
	main()