#!/usr/bin/env python3
import sys

def main():
    N = int(input())
    l = [0] * 1000
    for _ in range(N):
        s = input()
        l[len(s[1:-1])] += 1
    m = max(l)
    print(999 - l[::-1].index(m))
    return
        

if __name__ == '__main__':
    main()