using System;
using System.Collections.Generic;
class LongestInArr
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int count = 0;
        int bestcount = 0;
        string container = "";
        List<string> strList = new List<string>();
        for (int i = 0; i < n; i++)
        {
            strList.Add(Console.ReadLine());
        }
        for (int i = 0; i < strList.Count; i++)
        {
            for (int j = 0; j < strList.Count; j++)
            {
                if (j + 1 <= strList.Count)
                {
                    if (strList[i] == strList[j])
                    {
                        count++;
                    }
                    else
                    {
                        if (count > bestcount)
                        {
                            bestcount = count;
                            count = 0;
                            if (container != strList[i])
                            {
                                container = "";
                                container += strList[i];
                            }
                        }
                        else
                        {
                            count = 0;
                        }
                    }
                }
            }
        }
        Console.WriteLine(bestcount);
        for (int i = 0; i < bestcount; i++)
        {
            Console.WriteLine(container);
        }
    }
}