In this task, you are given books product reviews in English language. The goal is to classify the review as "POS" if the overall sentiment of the review is positive or as "NEG" if the overall sentiment of the review is negative.

Ex Input:
Excellent introduction to the field for physicists . Perhaps the best feature of this book is that it aims to convey the theory of Lie algebras and Lie groups to physicists. In doing so, the author is careful to give a very simplistic approach so that one not familiar with  the subject can understand it. Not to say that the book is elementary,  since it builds rapidly into the far more interesting aspects of Lie  Groups. A very good read

Ex Output:
POS


Ex Input:
Neither Thrilling, nor Chilling. . I'm scared to death of aliens, and I love nothing more than a good campfire tale, so I was so excited when I found this book.  I expected it to be a collection of great, creepy, true-sounding stories, kind of like urban legends, that you could tell to a group of friends to keep them up at night.  Boy, was I wrong.  It's just a collection of short stories about aliens.  Most of them are more sci-fi like than scary.  I was expecting stories of the traditional "alien encounter" type, but that's not what's in here.  They're not horribly written, just not really what the book promises.      The shape of the book is great, though.  It's got a sturdy cover, and it's made sort of like a field guide.  If it did contain creepy tales to tell around the campfire, it would be perfect to stuff in your backpack.  Too bad.

Ex Output:
NEG


Ex Input:
Very touching and inspiring . I really enjoyed this book.  Kendra Marty falls in love and wants to spend time with this young man, but she also feels the need to help her grandfather.  The decision she makes reveals a lot about her character,  caring and unselfish. A great Christian novel that I would recommend to  anyone

Ex Output:

POS