Sand_Glass

using System;

    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int left = 0;
            int right = N+1;

            for (int f = 1; f <= N; f++) {

                if(f < N/2 + 1){

                        for (int a = 1; a <= N; a++) {


                                    if (a <= left || a >= right) {

                                        Console.Write(".");

                                    }

                                    else {

                                        Console.Write("*");

                                    }

                        }
                    left++;
                    right--;
                    Console.WriteLine();

                }else{

                        for (int b = 1; b <= N; b++) {


                                    if (b <= left || b >= right) {

                                        Console.Write(".");

                                    }

                                    else {

                                        Console.Write("*");

                                    }

                        }




                        left--;
                        right++;
                        Console.WriteLine();


                }










            }
        }
    }