using System;

class Eggcelent
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());

        int width = 3 * n + 1;
        int height = 2 * n;
        int start = height - n + 2;
        int end = height;
        int drawArea = height / 2;

        for (int i = 1; i <= height; i++)
        {
            for (int j = 1; j <= width; j++)
            {
                if((j >= start && j <= end && (i == 1 || i == height)) ||
                    (j == start || j == end))
                    Console.Write("*");
                else if ((i == drawArea && j % 2 != 0 && j != 1 && j != width) ||
                         (i == drawArea + 1 && j % 2 == 0 && j != 2 && j != width - 1))
                    Console.Write("@");
                else
                    Console.Write(".");
            }
            Console.WriteLine();
            if (start > 2 && i < height / 2)
            {
                start -= 2;
                end += 2;
            }
            else if (i >= height - n / 2)
            {
                start += 2;
                end -= 2;
            }
        }
    }
}