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

Example Input: These two short tapes consist of a brief description of 50 years of white-red relations, treaties and conflicts. Because of its brevity, there is little detail presented. The text is interesting and appears to be factually correct. The presentation is relatively unbiased, and is quite interesting. It would make a good audio tape. The extra loud background music and simulated battlefield noise sometimes drowns out the text. The visual portion consists of old photographs, presumably authentic in detail and clips from old grade B movies which are quite far from authentic. These are rerun from 6 to 10 times throughout the presentation and, of course, have no bearing on the text. Except for the extreme brevity and the overwhelming background noise, one can ignore the visual effects and derive a worthwhile understanding of many aspects of the period of the Indian Wars.
Example Output: Negative

Example Input: Author doesn't believe in any biological interventions and feels you should just accept you kid's disability and get on with it. Needs to spell check his work also.
Example Output: Negative

Example Input: I cannot believe the "discounted" price of $23, when you can buy the identical item from other suppliers on Amazon for just over $3.00 (that's right, $20 less). Search on "key float".
Example Output:
Negative