#include <iostream>
using namespace std;

class Dummy {
public:
    char val;
    Dummy() { val = 'D'; }
    void set(char c) { val = c; }
    char get_val() { return val; }
};

class DummyA : public Dummy {
public:
    DummyA() { val = 'A'; }
    char get_a() { return 'A'; }
};

class DummyB : public Dummy {
public:
    DummyB() { val = 'B'; }
    char get_b() { return 'B'; }
};

class DummyWrapper {
public:
    Dummy *d;
    void set_d(char val) {
        d = val;
    }
};

class DummyWrapperA : public DummyWrapper {
public:
    DummyWrapperA() {
        d = new DummyA;
    }
};

class DummyWrapperB : public DummyWrapper {
public:
    DummyWrapperB() {
        d = new DummyB;
    }
};

int main() {
    DummyWrapperA *thing;
    thing = DummyWrapperA;
    cout << thing->d->get_a() << "\n";

    DummyWrapperB *thing2;
    thing2 = DummyWrapperB;
    cout << thing2->d->get_b() << "\n";
}