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

Example Input: We had to buy a new lunchbox for our son after 2 months (a different brand, machine-washable) because this one is way too hard to clean. I have turned it completely inside out, scrubbed between all the cracks, and still food is stuck in the seams andthreads. It is very durable, but we can't get rid of the smell or stains with a reasonable amount of effort.
Example Output: Negative

Example Input: Ordered two and tested them out: one had a bad pump but the return was easy.These airbeds are super cheap and great. Everyone who has slept on them says they are extremely comfortable. They hold the air well. I recommend them very highly
Example Output: Positive

Example Input: This entire book could be summed up in 10 pages. It is terribly repetitive. The basic premise is that one can use a HELOC instead of a Checking Account so that your money doesn't sit around idle while mortgage interest is accruing. This may have some merit, but it is not clear how much of the savings is due to putting all of your disposable income towards your mortgage. The big trade off is a loss of liquidity. I have been aware of this strategy for a while, and I hoped that this book would help to prove its effectivness, and explain exactly how to do it. It falls short. After reading numerous message boards on the subject, this book tought me nothing new. It really feels like an informercial that I paid for.
Example Output:
Negative