using System;
using System.Linq;

class Eggcelent
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        int height = 2 * N;
        int width = 3 * N - 1;
        int innerDots = N + 1;


        Console.WriteLine("{0}{1}{0}", new string('.', innerDots), new string('*', N - 1));
        int middleDots = innerDots;
        innerDots -= 2;

        while (innerDots > 1)
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", new string('.', innerDots), "*", new string('.', middleDots));
            innerDots -= 2;
            middleDots += 4;
        }

        for (int i = 0; i < N / 3; i++)
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", ".", "*", new string('.', middleDots));
        }

        Console.WriteLine("{0}{1}{2}{3}{1}{0}", ".", "*", String.Concat(Enumerable.Repeat("@.", (width - 3) / 2)), "@");
        Console.WriteLine("{0}{1}{2}{3}{1}{0}", ".", "*", String.Concat(Enumerable.Repeat(".@", (width - 3) / 2)), ".");

        for (int i = 0; i < N / 3; i++)
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", ".", "*", new string('.', middleDots));
        }

        innerDots += 2;
        middleDots -= 4;

        while (middleDots >= N + 1)
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", new string('.', innerDots), "*", new string('.', middleDots));
            innerDots += 2;
            middleDots -= 4;
        }
        Console.WriteLine("{0}{1}{0}", new string('.', innerDots), new string('*', N - 1));
    }
}