using System;

public class Program

{

    public static void Main()

    {

        Program p = new Program();

        //Main loop

        while (true) {

        //radius

        Console.WriteLine("Please Input Radius");

        int r = Int32.Parse(Console.ReadLine());

        //radius of missing hole

        Console.WriteLine("Please input the radius of the missing hole in the middle, if you want it to be full, please enter 0");

        int missing = Int32.Parse(Console.ReadLine());

        //compression to make an ellipse

        Console.WriteLine("Please input INTEGER horizontal and vertical compression (squishing) factors, separated by a space (make each 1 for a normal circle)");

        string[] st = Console.ReadLine().Split(' ');

        Console.WriteLine("\n\n");

        p.drawCircle(r, Int32.Parse(st[0]), Int32.Parse(st[1]), missing);

        Console.WriteLine("\n\n");

        }

    }

    public void drawCircle(int radius, int verCompFactor, int horCompFactor, int missingRad) {

        //for loops (extra condition stuff so that there isn't a lot of blank space)

        for (int i = (-radius + 1) / verCompFactor - 1; i < radius / verCompFactor + 1; i++) {

            for (int j = (-radius + 1) / horCompFactor - 1; j < radius / horCompFactor + 1; j++) {

                //If a point is less than the radius away from the center and more than the missing hole radius, draw it as an x

                if (Math.Round(Math.Sqrt(Math.Pow(i * verCompFactor, 2) + Math.Pow(j * horCompFactor, 2))) <= radius - 1 && 

                    Math.Round(Math.Sqrt(Math.Pow(i * verCompFactor, 2) + Math.Pow(j * horCompFactor, 2))) >= missingRad) {

                    Console.Write("X ");

                } else {

                    //otherwise, leave it blank

                    Console.Write("  ");

                }

            }

            //Next Line

            Console.WriteLine("");

        }

    }

}