#include <iostream>
using namespace std;

class Base
{
    public:
    virtual void print() { cout << "Base print" << endl;}
};

class DerivedA : public Base
{
    public:
    virtual void print() { cout << "Derived_A print" << endl;}
};

class DerivedB : public DerivedA
{
    public:
    virtual void print() {cout << "Derived_B print" << endl;}
};

int main()
{
    DerivedB b;

    Base* ptr = &b;
    ptr->print();

    return 0;
}