#include<iostream>
using namespace std;

class Derived;

class Base {
private:
    virtual void fun() { cout << "Base Fun"; }
friend int main();
};

class Derived: public Base {
public:
    void fun() { cout << "Derived Fun"; }
};

int main()
{
   Base *ptr = new Derived;
   ptr->fun();
   return 0;
}