import java.util.Scanner;

// Base class
class Vehicle {
    void showType() {
        System.out.println("Invalid input");
    }
}

// Derived classes
class Car extends Vehicle {
    void showType() {
        System.out.println("This is a car");
    }
}

class Bike extends Vehicle {
    void showType() {
        System.out.println("This is a bike");
    }
}

class Truck extends Vehicle {
    void showType() {
        System.out.println("This is a truck");
    }
}

// Main class
public class VehicleDescriptor {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int choice = sc.nextInt();
        Vehicle v;

        switch (choice) {
            case 1 -> v = new Car();
            case 2 -> v = new Bike();
            case 3 -> v = new Truck();
            default -> v = new Vehicle();
        }

        v.showType();
    }
}