import collections
from operator import itemgetter

n = int(input())
a = []
b = []
for i in range(n):
	s = str(input())
	eye = s[1:-1]
	a.append(len(eye))

c = dict(collections.Counter(a).most_common())
t = max(c.values())
for key, value in c.items():
    if value == t:
        b.append(key);
print(max(b))