import java.util.Scanner;
abstract class Vehicle {
	String wheels;
	abstract String noOfWheels(String a);
	void showWheels(){
		
		System.out.println(wheels+" wheel vehicle");
	}
	//write your own codes
}

class Car extends Vehicle {
	public String noOfWheels(String a){
		wheels=a;
		return a;
	}
//write your own codes

}

class Motorbike extends Vehicle {
	public String noOfWheels(String a){
		wheels=a;
		return a;
	}
//write your own codes
}

public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		Car ca=new Car();Motorbike mo=new Motorbike();
		ca.noOfWheels(sc.next());
		mo.noOfWheels(sc.next());
		ca.showWheels();
		mo.showWheels();
		//write your own codes
	}

}