#include <iostream>
    using namespace std;
    class InterfaceClass 
    {
        public:
        virtual void Display() = 0;
    };
    class ClassA : public InterfaceClass 
    {
        public:
        void Display() 
        {
            int  num = 10;
            cout << num;
        }
    };
    class ClassB : public InterfaceClass 
    {
        public:
        void Display()
        {
            cout <<" 14" << endl;
        }
    };
    int main()
    {
        ClassA object1;
        object1.Display();
        ClassB object2;
        object2.Display();
        return 0;
    }