03. Trapezoid

// http://bgcoder.com/Contests/3/CSharp-Fundamentals-2011-2012-Part-1-Test-Exam

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _03.Trapezoid
{
    class Trapezoid
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int stars = n;
            int dots = n;
            int innerDots = n - 1;
            DrawLine(dots, stars);
            Console.WriteLine();
            dots = n - 1;

            for (int i = 0; i < n-1; i++)
            {
                stars = 1;
                Console.WriteLine("{0}{1}{2}{1}", new string ('.',dots), new string('*', stars),
                    new string('.', innerDots));
                dots--;
                innerDots++;
            }
            stars = 2 * n;
            Console.WriteLine("{0}", new string('*', stars));
        }

        private static void DrawLine(int dots, int stars)
        {
            for (int i = 0; i <dots; i++)
            {
                Console.Write(".");
            }
            for (int i = 0; i <stars; i++)
            {
                Console.Write("*");
            }
        }
    }
}