#include <iostream>
using namespace std;

class A {
      int x;
};

class B : public A {
      int y;
};

int main() {
    A a; B b;
    cout << sizeof(a) << " " << sizeof(b) << endl;
    cout << sizeof(A) << " " << sizeof(B) << endl;
    A* pa = &b;
//    B* pb = &a;
    A& ra = b;
//    B& rb = a;
    return 0;
}