#include <iostream>
using namespace std;
class Base {
public:
    virtual void print() {
        cout << "Base";
    }
};
class Derived : public Base {
public:
    void print() {
        cout << "Derived";
    }
};
void show(Base *p) {
    p->print();
}
int main() {
    Base b;
    Derived d;
    show(&b);
    show(&d);
    return 0;
}