#include <iostream>

using namespace std;

#define interface class

interface IPhone {

public:

        virtual void send(const char*)=0;

};

class AnyCall : public IPhone {

public:

        void send(const char* n) {

               printf("calling %s with AnyCall...\n", n);

        }

};

class Cyon : public IPhone {

public:

        void send(const char* n) {

               printf("calling %s with Cyon...\n", n);

        }

};

class Sky : public IPhone {

public:

        void send(const char* n) {

               printf("calling %s with Sky...\n", n);

        }

};

class Person {

public:

        void userPhone(IPhone *p, const char *n) {

               p->send(n);

        }

};

int main(void) {

        Person p;

        AnyCall a;

        p.userPhone(&a, "000-0000-0000");

        Cyon c;

        p.userPhone(&c, "000-0000-0000");

        Sky s;

        p.userPhone(&s, "000-0000-0000");

        return 0;

}