using System;
namespace ConsoleApp3
{
    class Program
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());

            int height = (n / 2) + 4;
            int weight = (2 * n) - 1;

            Console.WriteLine("@{1}@{1}@", new string('@', 1), new string(' ', (weight - 3) / 2));
            Console.WriteLine("**{0}*{0}**", new string(' ', (weight - 3 - 2) / 2));
            for (int i = 0; i < height - 6; i++)
            {
                Console.WriteLine("*.{0}* {1}*{2}.{2}*{1} *{0}.*", new string('.', i), new string(' ', (weight - 9 - 1 - (4 * i)) / 2), new string('.', i));
            }
            Console.WriteLine("*{0}*{1}.{1}*{0}*", new string('.', (n / 2) - 1), new string('.', (n / 2) - 2));
            Console.WriteLine("*{0}{1}.{1}{0}*", new string('.', n / 2), new string('*', ((weight - 3) - n) / 2));
            Console.WriteLine("{0}", new string('*', weight));
            Console.WriteLine("{0}", new string('*', weight));

        }
    }
}