class Vehicle {
  void start(){System.out.print("Vehicle: ");}
  }
class Motorcycle extends Vehicle {
 void second(){System.out.println("Motorcycle: 2nd");}
}
class Truck extends Vehicle {
 void third(){System.out.println("Truck: 3rd");}
}
class Car extends Vehicle {
  void first(){System.out.println("Car: 1st");}
}
class Bike extends Vehicle {
 void fourth(){System.out.println("Bike: 4th");}
}
class TestInheritance3{
	public static void main(String[] args){
		Car c=new Car();
		c.start();
		c.first();
		Motorcycle m=new Motorcycle();
		m.start();
		m.second();
		Truck t=new Truck();
		t.start();
		t.third();
		Bike b=new Bike();
		b.start();	b.fourth(); }}