package net.ipipip0129.yukicoder.no706;

import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        int[] cnt_list = new int[1001];
        Scanner scan = new Scanner(System.in);
        int num = Integer.parseInt(scan.nextLine());
        for (int i = 0; i < num; i++) {
            cnt_list[scan.nextLine().length() - 2]++;
        }

        int max_index = 0;
        int max_num = 0;

        for (int i = 0; i < 1001; i++) {
            if (max_num <= cnt_list[i]) {
                max_index = i;
                max_num = cnt_list[i];
            }
        }
        System.out.println(max_index);
    }
}