using System;

public class Program

{

    class Point

    {   public virtual int x { get; set; }

        public virtual int y { get; set; }

        public Point() {}

        public Point(int x, int y) { this.x= x; this.y= y; }

        public Point setPoint(Point p) 

        {   if(p != null) { this.x= p.x; this.y= p.y; }

            return this;

        }

        public override string ToString()

        {   return string.Format("({0}:{1})", x, y);    //(x:y)

        }

    }

    class Shape: Point

    {   Point[] points= null;

        public Shape() {}

        public Shape(Point a, int numb, Point[] p)

        {   this.setPoint(a);

            this.points= new Point[numb];

            for(int i=0; i < numb; i++)

            {   try 

                {   this.points[i]= p[i]??(new Point());

                }

                catch(Exception) 

                {   this.points[i]= new Point(); 

                }

             }

        }

        public override string ToString()

        {   string result= "{"; //new int[] {1, 2, 3, 4}

            if(points != null)

            {   for(int i= 0; i < this.points.Length; i++)

                {   result += points[i];

            }   }

            else result += "no points";

            return base.ToString() + result + "}";

        }

    }

    class Triangle: Shape

    {   public Triangle(Point p, Point[] a): base(p, 3, a) {}

        public override string ToString()

        {   return "Triangle  " + base.ToString();

        }

    }

    class Rectangle: Shape

    {   public Rectangle(Point p, Point[] a): base(p, 4, a) {}

        public override string ToString()

        {   return "Rectangle " + base.ToString();

        }

    }

    public static void Main()

    {

        Triangle  t= new  Triangle(new Point(100, 100), new Point[] {new Point(1, 1), new Point(2, 2), new Point(3, 3)});

        //Triangle  t= new  Triangle(new Point(100, 100), null);

        //Console.WriteLine(t);

        Rectangle r= new Rectangle(new Point(200, 200), new Point[] {new Point(11, 11), new Point(12, 12), new Point(13, 13), new Point(14, 14)});

        //Console.WriteLine(r);

        Shape[] shapes= new Shape[] {t, r};

        for(int i= 0; i < shapes.Length; i++)

            Console.WriteLine(shapes[i]);

    }

}