package test;

public class Main {
    public static void main(String[] args) {
        Human hm = new Human();
        System.out.println("Now human:");
        hm.walk();
        hm.say();
        Child ch = new Child();
        System.out.println("\nNow child:");
        ch.walk();
        ch.say();
    }
}

class Human {
    public void say() {
        System.out.println("Hello!");
    }

    public void walk() {
        System.out.println("top top");
    }
}

class Child extends Human {
    public void say() {
        System.out.println("Blblbl");
    }
}