using System;

namespace ConsoleApp1
{
    class Program
    {

        public static void Main()
        {

            int n = int.Parse(Console.ReadLine());
            Console.WriteLine("@{0}@{0}@", new string(' ', n - 2));
            Console.WriteLine("**{0}*{0}**", new string(' ', n - 3));
            for (int i = 0; i < n / 2 - 2; i++)
            {
                Console.WriteLine("*{0}*{1}*{2}*{1}*{0}*", new string('.', i + 1), new string(' ', n - 5 - 2 * i), new string('.', 1 + 2 * i));
            }
            Console.WriteLine("*{0}*{1}*{0}*", new string('.', n / 2 - 1), new string('.', 1 + 2 * (n / 2 - 2)));

            Console.WriteLine("*{0}{1}.{1}{0}*", new string('.', n / 2), new string('*', n / 2 - 2));

            Console.WriteLine(new string('*', 2 * n - 1));
            Console.WriteLine(new string('*', 2 * n - 1));

        }
    }
}