Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Example Input: This book in the beginning was so slow that I finished a book twice it's length before I finished the first chapter of Tess of the D'Urdubervilles.
Example Output: Negative

Example Input: Bought this for my 5 year old Justice Leaguer. My son is not a rough player but we went through 4 (YES, FOUR) of them before we finally got one where the elevator didn't break in the 1st 2 weeks. Mattel needs to get their act together and design toys that have durability. VERY disappointing!
Example Output: Negative

Example Input: My two year absolutely loves puzzles and this has been a great addition to our collection.. It's sturdy and I don't think she'll be able to wear it out or break it.
Example Output:
Positive