inicjały

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

namespace Wzorki
{
    class Program
    {
        static public void prostokat (int n, int m)
        {
            for(int i = 0; i < n; i++ )
            {
                Console.Write("*");
            }
            Console.WriteLine();

            for (int j = 1; j < m - 1; j++)
            {
                Console.Write("*");
                for (int i = 1; i < n - 1; i++)
                    Console.Write(" ");
                Console.WriteLine("*");
            }

            for (int i = 0; i < n; i++)
            {
                Console.Write("*");
            }
            Console.WriteLine();


        }


        static public void IKS(int n)
        {
            if (n < 3) throw new ArgumentException("zbyt maly rozmiar");
            if (n % 2 == 0) n = n + 1;

            //gora
            for (int i = 0; i < n/2; i++)
            {
                for (int j = 0; j < i; j++)
                    Console.Write(" ");
                Console.Write("*");

                for (int j = 0; j < n - 2 - 2 * i; j++)
                    Console.Write(" ");
                Console.WriteLine("*");
            }

            //srodkowa gwiazdka

            for (int i = 0; i < n / 2; i++)
                Console.Write(" ");
            Console.WriteLine("*");

            //dol
            for (int i = n/2; i > 0; i--)
            {
                for (int j = 1; j < i; j++)
                    Console.Write(" ");
                Console.Write("*");

                for (int j = -2; j < n - 2 - 2 * i; j++)
                    Console.Write(" ");
                Console.WriteLine("*");
            }


        }

        static public void letter_d (int n)
        {
            //1linia
            for (int i = 0; i < n-(n/5); i++)
            {
                Console.Write("*");
            }
            for (int i = n-2; i < n; i++)
            {
                Console.Write(" ");
            }
            Console.WriteLine();

            //skos
            //Console.Write("*");
            for (int i = (n / 5); i>0; i-- )
            {
                Console.Write("*");
                for(int j = 0; j < n-i; j++)
                {
                    Console.Write(" ");
                }
                Console.WriteLine("*");
            }

            //pionowe kreski
            for(int i = 0; i < n - (n / 5); i++)
            {
                Console.Write("*");
                for(int j = 0; j < n; j++ )
                {
                    Console.Write(" ");
                }
                Console.WriteLine("*");
            }

            //2skos
            for (int i =  0; i < (n / 5); i++)
            {
                Console.Write("*");
                for (int j = n - i - 1; j > 0; j--)
                {
                    Console.Write(" ");
                }
                Console.WriteLine("*");
            }

            //ostatnia linia
            for (int i = 0; i < n - (n / 5); i++)
            {
                Console.Write("*");
            }
            for (int i = n - 2; i < n; i++)
            {
                Console.Write(" ");
            }
            Console.WriteLine();


            for (int x = 0; x < n*10; x++)
            {
                Console.Write("_");
            }
            Console.WriteLine();


        }

        static public void letter_w(int n)
        {
            //1linia
            for (int j = 0; j < 2; j++)
            {
                Console.Write("*");
                for (int i = 1; i < (n / 2); i++)
                {
                    Console.Write(" ");
                }
                Console.Write("*");
            }
            Console.WriteLine(" ");

            //2linia skosy
            for (int i = 1; i < n/4; i++)
            {
                for(int l = 1; l <= i; l++)
                    Console.Write(" ");
                Console.WriteLine("*");



                for (int j = 1; j < (n - i) / 2-1; j++)
                {
                    Console.Write(" ");
                }
                Console.Write("*");

                for (int j = 1; j < (n - i) / 2 - 1; j++)
                {
                    Console.Write(" ");
                }
                Console.WriteLine("*");

            }



            Console.ReadKey();
        }

            static void Main(string[] args)
        {
            //prostokat(18, 9);
            //IKS(7);
            letter_d(10);
            letter_w(20);
        }


    }
}