abstract class vehicle {
    abstract void start();
}

class Bike extends vehicle {
    public void start() {
        System.out.println("Starts with kick");
    }
}

class Car extends vehicle {
    public void start() {
        System.out.println("Starts with key");
    }
    public static void main(String[] args) {
        Bike bike = new Bike();
        bike.start();
        Car car = new Car();
        car.start();
    }
}