/*
 *
 * 7.37
 *
 *
 */

/*
class Sales_data {
public:
	// defines the default constructor as well as one that takes a string argument
	Sales_data(std::string s = ""): bookNo(s) { }
	// remaining constructors unchanged
	Sales_data(std::string s, unsigned cnt, double rev):
		bookNo(s), units_sold(cnt), revenue(rev*cnt) { }
	Sales_data(std::istream &is) { read(is, *this); }
	// remaining members as before
};
*/

/*
  Sales_data first_item(cin); // Sales_data(std::istream &is) { read(is, *this); }
  int main() {
  Sales_data next; // Sales_data(std::string s = ""): bookNo(s) { }
  Sales_data last("9-999-99999-9"); // Sales_data(std::string s = ""): bookNo(s) { }
}
 */

int main () {
	return 0;
}