using System;

​

class Trapezoid

{

    static void Main()

    {

        int n = int.Parse(Console.ReadLine());

​

        Console.Write(new string('.', n));

        Console.Write(new string('*', n));

        Console.WriteLine();

        for (int row = 0; row < n - 1; row++)

        {

            Console.Write(new string ('.', n - row - 1));

            Console.Write('*');

            Console.Write(new string ('.', n + row - 1));

            Console.Write('*');

            Console.WriteLine();

        }

​

        for (int i = 0; i < 2 * n; i++)

        {

            Console.Write('*');

        }

    }

}

​

​