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

Example Input: My 2 year old son is huge Thomas fan. This DVD has long introductions to each story in which children and adults are interviewed - my son couldn't care less. He just wants to see trains! We have a portable DVD player, and it is a big pain to try to fast forward past these introductions, and he (and I) just ends up frustrated. My advice - pick another DVD.
Example Output: Negative

Example Input: I bought this set for my husband and brother for Christmas last year then we ended up buying a different set for the movie cash for the new movie. I went to sell this set at used movie retailer and they informed me it was from overseas and possibly a bootleg. WATCH OUT!!!!!!!!
Example Output: Negative

Example Input: Dramatica: A New Theory of Story is a useful prep for using the software. It's an interesting and complete theory of story too, which is great. The book in general is well worth reading. My only problem is that if it's worth saying, it's worth saying WELL and this book uses twice the number of words it needs. The density of words also confuses the message. I felt, on more than one occasion, that the author was willfully complicating the message in order to ensure more sales of the software.Again, worth reading... valid and useful ideas... enough extra words that it undermines its own usefulness.
Example Output:
Positive