#include 
using namespace std;

class Car {
private:
    string model;
    
public:
    Car() {}
    Car(string _model) {
        model = _model;
    }
    string get_model() {
        return model;
    }
    void set_model(string s) {
        model = s;
    }
};
class SUV : public Car {
private:
    bool is4x4;
public:
    SUV(string _model, bool _is4x4) : Car(_model) {
        is4x4 = _is4x4;
    }
    void set4x4(bool b) {
        is4x4 = b;
    }
    bool get_is4x4() {
        return is4x4;
    }
};
int main() {
 
    SUV s("audi", true);
    
    s.
    return 0;
}