#include <iostream>

class Base {
public:
    virtual void imprimir() = 0;
};

class Derivada1 : public Base {
public:
    void imprimir() {
        std::cout << "Derivada1\n";
    }
};

class Derivada2 : public Base {
public:
    void imprimir() {
        std::cout << "Derivada2\n";
    }
};

int main() {
    Derivada1 d1;
    Derivada2 d2;
    Base* pb = &d1;
    pb->imprimir();
    pb = &d2;
    pb->imprimir();
    return 0;
}