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

Input: Consider Input: The book covers several generations, so with each generation you have to re-learn all the characters. It is difficult to keep track of who's who when every time you get to know the cast, 200 years suddenly pass and we're in the middle of a new crisis. I didn't read the whole series because of this -- it was obnoxious.

Output: Negative

Input: Consider Input: Only has limited access to OBDII data stream unless you pay more money to upgrade the software.

Output: Negative

Input: Consider Input: leaks after leaks after leaks. i have patched them with super glue and bike patches and they just dont seem to stop comming. i am tired of patching them. dont ever buy a air mattress. just fork out the cash for a good mattress.
Output: Negative