using System;
using System.Collections.Generic;
using System.Linq;

namespace StudyApp
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = int.Parse(Console.ReadLine());
            var eye_map = new Dictionary<int, int>();

            for (int i = 0; i < num; i++)
            {
                int eye_num = Console.ReadLine().Length - 2;

                if (eye_map.ContainsKey(eye_num))
                    eye_map[eye_num]++;
                else
                    eye_map.Add(eye_num, 1);
            }

            int max_eye_count = eye_map.Values.Max();

            var frequent_eye = eye_map.Where(e => e.Value.Equals(max_eye_count)).Select(e => e.Key).Max();
            Console.WriteLine(frequent_eye);
        }
    }
}