Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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[Python Language]

Using loops of any kind, lists, or Sets is not allowed.

Sloan’s Book Collection

Sloan loves reading books. She recently started reading an AI generated series called “Harry Trotter”.

Sloan is collecting books from the series at her nearest bookstore. Since the series is AI generated, the publishers have produced an infinite collection of the books where each book is identified by a unique integer. The bookstore has exactly one copy of each book.

Sloan wants to buy the books in the range [l,r], where l ≤ r. As an example, the range [−3,3] means that Sloan wants to buy the books  − 3,  − 2,  − 1, 0, 1, 2, and 3.

Pam also loves the series (or maybe annoying Sloan– who knows, really), and he manages to sneak into the bookstore very early to buy all of the books in the range [d,u], where d ≤ u. When Sloan later visits, sadly she will not find those books there anymore.

For example, if Sloan tries to buy books [−2,3] and Pam has bought books [0,2], Sloan would only receive books  − 2,  − 1, and 3.

The reading recommendation score of the books is the product of the book numbers received. So if Sloan gets books  − 2,  − 1, and 3, for instance, the reading recommendation score will be  − 2 ×  − 1 × 3 = 6.

Your task is to write a program that will help Angela determine whether the reading recommendation score of the books she receives is NEGATIVE, ZERO, POSITIVE, or EMPTY.

Filename

Your filename for this question must be q2.py.

Input

There are four lines of input.

  • The first line of input will contain the integer l, the lower bound of the collection of books that Sloan would like to buy.
  • The second line of input will contain the integer r, the upper bound of the collection of books that Sloan would like to buy.
  • The third line of input will contain the integer d, the lower bound of the collection of books that Pam buys.
  • The fourth line of input will contain the integer u, the upper bound of the collection of books that Pam buys.

Output

Let s be the reading recommendation score of the book collection Sloan receives.

  • If s is less than 0, print NEGATIVE.
  • If s is exactly 0, print ZERO.
  • If s is greater than 0, print POSITIVE.
  • If s does not exist, print EMPTY.

Sample Input 1

1 10 3 7

Sample Output 1

POSITIVE

Sample Input 2

1 3 1 3

Sample Output 2

EMPTY

Sample Input 3

-5 5 -2 3

Sample Output 3

NEGATIVE

Sample Input 4

-1 3 -2 -1

Sample Output 4

ZERO

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