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

Example Input: overall, the documentary was pretty cool. however, about 99% of the beach boys clips were from a prior documentary, an american family from '85. they should have included the clip of dennis singing manson's song never learnt not to love (aka cease to exist). especially since the title of the movie is the beach boys & the satan. but did have cool footage of interviews with dick dale and dean torrence and the chantays. also kim fowley was cool too.
Example Output: Positive

Example Input: This book has solved the problems we had while trying to manage my son's diabetes.You can find all answers in diabetes management.
Example Output: Positive

Example Input: A complete waste of time. Typographical errors, poor grammar, and a totally pathetic plot add up to absolutely nothing. I'm embarrassed for this author and very disappointed I actually paid for this book.
Example Output:
Negative