abstract class LivingThing {

	public void breath() {   //Concrete method
	
		System.out.println("Living Thing breathing...");
	}

	public void eat() {
		
		System.out.println("Living Thing eating...");
	}
	/**
	* Abstract method walk()
	* We want this method to be implemented by a
	* Concrete class.
	*/
	public abstract void walk();
}

public class Human extends LivingThing
{
	public void walk() {
		System.out.println("Human walks...");
	}
	
	public static void main(String[] args) {
		
		System.out.println("Hello from main");
		Human h = new Human();
		h.breath();
		h.eat();
		h.walk();
	}	
}