using System;
 
public interface IAnimal
{
	bool IsWarmBlooded { get; }
}
 
public abstract class Mammal : IAnimal
{
	public bool IsWarmBlooded { get { return true; } }	
}
 
public class Cat : Mammal
{
	public void Purr()
	{
		Console.WriteLine("Purr!");
	}
}
 
public class Dog : Mammal
{
	public void Bark()
	{
		Console.WriteLine("Woof!");
	}
}
 
public static class Program
{
	public static void Main()
	{
		var dog = new Dog();
		var cat = new Cat();
 
		dog.Bark();
		cat.Purr();
 
		Console.WriteLine(dog.IsWarmBlooded);
		Console.WriteLine(cat.IsWarmBlooded);
	}
}
 

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