#include <iostream>
using namespace std;
class A{
    public:
    void show(){
        cout<<"In A show"<<endl;
    }
};
class B : public A{
    public:
    void show(){
        cout<<"In B show"<<endl;
    }
};
int main() {
    A *a;
    B obj;
    
    a = &b;
    
    return 0;
}