#!python
# -*- coding: utf-8 -*-


def main():
    N = int(input())
    S = []
    for i in range(N):
        S.append(input())

    S_num = []
    for s in S:
        S_num.append(len(s) - 2)

    ls = [0 for i in range(1000)]
    for s in S_num:
        ls[s] += 1

    max_index = 0
    for i in range(1, 1000):
        if ls[max_index] <= ls[i]:
            max_index = i

    print(max_index)


if __name__ == '__main__':
    main()