import java.io.*;
class Animal {
   public String  type ;
   public Animal() {
  	type = "animal  ";
   }
   public static String sounds() {
	return "not known";
   }
   public void prnt() {
     	System.out.println(type + sounds());
   }
}
class Dog extends Animal {
   public Dog() {
	type = "dog   ";
   }
   public static String sounds() {
        return "haf";
   }
}
class Cat extends Animal {
   public Cat() {
	type = "cat   ";
   }
   public static String sounds() {
        return "miau";
   }
}
public class AnimS {
  public static void main(String [] args) {
   Animal notknown = new Animal();
   Dog filipes = new Dog();
   Cat tom = new Cat();
   tom.prnt();
   filipes.prnt();
   notknown.prnt();
  }
}