#include <iostream>

using namespace std;

class Rectangle {
public:
  Rectangle();
  int GetSideCount();
protected:
  int length, height;
private:
  int side_count;
};

Rectangle::Rectangle() : side_count(4) {}

int Rectangle::GetSideCount() {
  return this->side_count;
}

class Square : public Rectangle {
public:
  Square(int);
};

Square::Square(int s) {
  length = height = s;
  cout<<"A square has "<<this->GetSideCount()<<" sides.\n";
  // side_count = 2;
  //  this->side_count = 2;
}

int main() {
  Square S(5);

  return 0;
}