from collections import Counter

N = int(input())

li = []

for i in range(N):
	S = list(input())
	li.append(len(S)-2)
	

def calculate_mode(data):
	c = Counter(data)
	freq_scores = c.most_common()
	max_count = freq_scores[0][1]

	modes = []
	for num in freq_scores:
		if num[1] == max_count:
			modes.append(num[0])
	return(modes)

modes = calculate_mode(li)
print(max(modes))