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

Example Input: This book contains such advise as writing down personal affirmations which you will repeat to yourself at the beginning of each day:I am calm, prepared, and entertaining.I am fit and beautiful.I am humble, patient, and compassionate.I am enough, just the way I am.If this kind of advise is your cup of tea, then this is your kind of book.
Example Output: Negative

Example Input: I received the product in a timely manner. It was as advertised. I have used it a number of times and it works well although I haven't gotten the results from it I had hoped for. No fault of the seller or the product though.
Example Output: Positive

Example Input: I was very eager to see a video of this outstanding woman, but I was very unhappy with the product. Dull. Two other items included on the video, but the part about Wells consisted of a person reading from a book. Get the book biography instead of this product--a waste of money.
Example Output:
Negative