Forest_Road

using System;

class Program
{
    static void Main()
    {
        int N = int.Parse(Console.ReadLine());
        int height = N * 2 - 1;
        int leftDots = 0;
        int rightDots = 0;
        string row = null;

        for (int i = 0; i < height; i++)
        {
            if (i <= height / 2)
            {
                leftDots = i;
                rightDots = N - i - 1;
                row = new string('.', leftDots);
                row += '*';
                row += new string('.', rightDots);
                Console.WriteLine(row);
            }
            else
            {
                leftDots = height - i - 1;
                rightDots = i - (height / 2);
                row = new string('.', leftDots);
                row += "*";
                row += new string('.', rightDots);
                Console.WriteLine(row);
            }
        }
    }
}