n = int(input())
s = [input() for i in range(n)]

memo = {}
for i in range(n):
    tmp = len(s[i]) - 2
    if tmp not in memo:
        memo[tmp] = 1
    else:
        memo[tmp] += 1

ans = 0
ans_num = 0
for num in memo:
    if memo[num] >= ans_num and num > ans:
        ans_num = memo[num]
        ans = num
print(ans)