N = int(input())
S = []
for i in range(N):
    S.append(input())
num = [0 for i in range(1000)]
for i in S:
    num[len(i)-2] += 1
m = max(num)
for i in range(999, -1, -1):
    if num[i] == m:
        print(i)
        break