#include <iostream>

using namespace std;

class A

{

public:

        virtual int print()=;

};

class B: public A

{

public:

        virtual int get()=;

        virtual int print()

        {

                cout<<get()<<endl;

        }

};

class C: public B

{

public:

        int get()

        {

                return ;

        }

};

int func(A* a)

{

        a->print();

}

int main()

{

        C c;

        func(&c);

        return ;

}