#include <iostream>
using namespace std;

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

class Derived : public Base {
public:
    void show() {
        cout << "Derived";
    }
};

void display(Base *p) {
    p->show();
}

int main() {
    Derived d;
    display(&d);
    Base b;
    display(&b);
    return 0;
}