#include <iostream>
using namespace std;

class A {
private:
    int a;
public:

    A (int _a) {
        a = _a;
    }
    virtual void print() {
        cout << a << endl;
    }
};

class B : public A {
private:
    int b;
public:
    B(int _a, int _b) : A(_a) {
        b = _b;
    }

    virtual void print() override {
        cout << b << endl;
    }
};

int main() {

    A * a = new B(4, 5);

    a->print();

     return 0;
}