class Animal implements Zvuky { //				?co to ted udela?
    String  type ;
    Animal() {		type = "animal  ";}
    public String sounds() {	return "not known";}
    void prnt() {     	System.out.println(type + sounds());}
}
class Dog extends Animal implements Zvuky {
    Dog() {		type = "dog   "; }
    public String sounds() {        	return "haf";   }
}
class Cat extends Animal implements Zvuky {
    Cat() {		type = "cat   ";   }
    public String sounds() {        return "miau";   }
}
 public class RAnim {
  public static void main(String [] args) {
   Animal notknown = new Animal();
   Zvuky z = new Animal(); 
   Dog filipes = new Dog();
   Cat tom = new Cat();
   System.out.println(z.sounds());
	  z = filipes;
   System.out.println(z.sounds());
  // tom.prnt();
  // filipes.prnt();
  // notknown.prnt();
} }