#include <iostream>

using namespace std;
class Human {

    public:

    virtual void sleep()=0;
    virtual void work() {
        cout<<"I'm working.\n";

    }

};
class student:public Human{
  public:
  void sleep(){
      cout<<"I'm sleeping.\n";

  }
  void  work(){
      cout<<"I don't like work.\n";
  }
};

int main()
{
    student kent;
    kent.sleep();
    kent.work();


   return 0;
}