public interface IVehicle{
    void Drive();
    void Fly();
}
public class MultiFunctionalCar : IVehicle{
    public void Drive(){
        Console.WriteLine("Drive a multifunctional car");
    }
    public void Fly(){
        Console.WriteLine("Fly a multifunctional car");
    }
}
public class Car : IVehicle{
    public void Drive(){
		Console.WriteLine("Driving a car");
    }
    public void Fly(){
        throw new NotImplementedException();
    }
}
public class Airplane : IVehicle{
    public void Drive(){
        throw new NotImplementedException();
    }
    public void Fly(){
        Console.WriteLine("Flying a plane");
    }
}