using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        var N = int.Parse(ReadLine());
        var a = new int[1100];
        for (int i = 0; i < N; i++)
        {
            var r = ReadLine();
            a[r.Length]++;
        }
        var m = a.Max();
        WriteLine( a.Select((x,i)=>new{x,i}).Where(b=>b.x==m).OrderBy(c=>c.i).Last().i-2);
    }
}