class Vehicle {
    void start() {
        System.out.println("Vehicle is starting...");
     }   
}
class Car extends Vehicle {
    void showCar() {
        System.out.println("This is a Car.");
    }
}
class Bike extends Vehicle {
    void showBike() {
        System.out.println("This is a Bike.");
    }
}
public class Main {
    public static void main(String[] args) {
        Car c = new Car();
        Bike b = new Bike();

        c.start();     
        c.showCar();   

        b.start();     
        b.showBike();   
    }
}