using System;

abstract class Animal {
  public abstract string Name { get; }
  public abstract void WhoAreYou();
  public abstract bool Likes(string food);
  public abstract void Speak();
}

class Dog : Animal {
  public override string Name { get { return "dog"; } }
  public override void WhoAreYou() { Console.WriteLine("I am a dog"); }
  public override bool Likes(string food) { 
    return food == "bones" || food == "meat";
  }
  public override void Speak() { Console.WriteLine("Wooff"); }
}

class Cat : Animal {
  public override string Name { get { return "cat"; } }
  public override void WhoAreYou() { Console.WriteLine("I am a cat"); }
  public override bool Likes(string food) { 
    return food == "milk" || food == "fish";
  }
  public override void Speak() { Console.WriteLine("Meoow"); }
}

class Cow : Animal {
  public override string Name { get { return "cow"; } }
  public override void WhoAreYou() { Console.WriteLine("I am a cow"); }
  public override bool Likes(string food) { 
    return food == "grass";
  }
  public override void Speak() { Console.WriteLine("Moooh"); }
}

class Test {
  static Animal[] farm = {
    new Cow(),
    new Dog(),
    new Cow(),
    new Cat(),
    new Cat()
  };
  
  public static void Main() {
    foreach (Animal a in farm)
      if (a.Likes("fish")) a.Speak();
      else Console.WriteLine("A " + a.Name + " does not like fish");
  }
}