from collections import defaultdict
dic = defaultdict(int)
n = int(input())
ma = 0
ans = 0
for i in range(n):
    s = input()
    m = len(s) - 2
    dic[m] += 1
    if dic[m] > ma:
        ma = dic[m]
        ans = m
    elif dic[m] == ma:
        if ans < m:
            ma = dic[m]
            ans = m

print(ans)