#include <iostream.h>
class Side
  {
    protected:
      int l;
    public:
      void set_values (int x)
        { l=x;}
  };
class Square: public Side
  {
    public:
      int sq()
      { return (l *l); }
  };
class Cube:public Side
  {
   public:
     int cub()
      { return (l *l*l); }
  };
int main () 
  {
    Square s;
    s.set_values (10);
    cout << "The square value is::" << s.sq() << endl;
    Cube c;
    c.set_values (20);
    cout << "The cube value is::" << c.cub() << endl;
    return 0;
  }