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.
One example: Hopeful for those who seek harmony in the world . I wouldn't recommend this to anyone who thinks that religious wars, repression of individual spirits or rape of the earth are good things. Those who seek peace, harmony, celebration of each of us and respect for our earth will find this hopeful
Solution is here: POS
Explanation: The overall sentiment of the review is positive as the reviewer mentions positive expressions such as 'hopeful', 'will find this helpful' etc.. Hence, the label is 'POS'.

Now, solve this: Grade school mental workout!!! . This book is the best of its kind--nothing comes close to the number and variety of mental puzzles of various levels of difficulty...word games, optical tricks, math puzzles, et cetera. This book is amazing. I've given several to teachers. Excellent for third grade up to high school. The only thing I'd change about the book is the color: the book only has black, white, gray and blue
Solution:
POS