#include <iostream>

class A {
public:
    int a;
    A() : a(0) {};
    A(int v) : a(v) {};
};

class B : public A {
public:
    int b;
    B(int v) : b(v) {};
};

void print(A* pointer) {
    std::cout << pointer->a << std::endl;
}

int main() {
    A a(1);
    B b(2);
    print(&a);
    print(&b);
    return 0;
}