using System.IO;
using System;
 
public class Shape
{
    public string GetName(){return "shape";}
}
 
public class Ball : Shape
{
    public new string GetName(){return "ball";}
}
 
public class Pet
{
    public virtual string GetName(){return "pet";}
}
 
public class Cat : Pet
{
    public override string GetName(){return "cat";}
}
 
class Program
{
    static void Main(string[] args)
    {
        Pet myPet = new Cat();
        Cat johnsCat = new Cat();
        Shape shape = new Ball();
 
        Console.WriteLine(string.Format("My {0} is playing with a {1}. John's {2} is sleeping", myPet.GetName(), shape.GetName(), johnsCat.GetName()));
    }
}

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