#include 


using namespace std;
class Vehicle {
public:
    Vehicle() {
        cout << "Vehicle" << endl;
    }
};
class Car : public Vehicle {
public:
    Car() : Vehicle() {
        cout << "Car" << endl;
    }
};
class Bus : public Vehicle {
public:
    Bus() : Vehicle() {
        cout << "Bus" << endl;
    }
};

class CityBus : public Bus {
public:
    CityBus() : Bus() {
        cout << "City bus" << endl;
    }
};
int main()
{
    
    CityBus c;
    return 0;
}