using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public class SP

    {

        protected int X;

        protected int Y;

​

        public SP()

        {

        }

        public SP(int X, int Y)

        {

            this.X = X;

            this.Y = Y;

        }

        //Getters

        //Setters

        public override string ToString()

        {

            return "X=" + X + ", Y=" + Y;

        }

    }

    public class A : SP

    {

        private int Z;

​

        public A(int X, int Y, int Z)

        {

            this.X = X;

            this.Y = Y;

            this.Z = Z;

        }

        public int GetZ()

        {

            return this.Z;

        }

        public void SetZ(int Z)

        {

            this.Z = Z;

        }

        public override string ToString()

        {

            return "X=" + X + ", Y=" + Y + ", Z=" + Z;

        }

    }

    public class B : SP

    {

        private int W;

​

        public B(int X, int Y, int W) : base(X, Y)

        {

            this.W = W;

        }

        public int GetW()

        {

            return this.W;

        }

        public void SetW(int W)

        {

            this.W = W;

        }

    }

}