using System;

public class Program

{

    public static void Main()

    {

        new Mammal("George the Cat");

    }

}

​

​

public class Animal

{

    public Animal() { Console.WriteLine("An unknown animal gets born."); }

    public Animal(string name) { Console.WriteLine(name + " gets born"); }

}

​

public class Mammal : Animal

{

    public Mammal(string name) : base(name)

    {

        Console.WriteLine(name + " is a mammal.");

    }

}