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

Ex 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.

Ex Output:
Negative

Ex Input:
The book was boring and to far fetched to be entertaining. The characters were not believable and left me with wanting to many unanswered questions. The author took to many liberties with facts. All in all, I just didn't care for the book, skipped thru pages to end it so I could go on to more enjoyable reading. Amazon offers so many options and choices that I'm bound to pick a lemon once in awhile. I always read the brief description of the book before I buy but in this book that wasn't enough.

Ex Output:
Negative

Ex Input:
Chaos is such a visually stunning field of study, since you invariably run into those computer generated figures of Julia sets or random fractal landscapes or cloud formations.But can we get a rigorous, first principles explanation that is broadly accessible to undergraduates with good, but not advanced math preparation? Well, you might consider this recent book. The authors have gone to some length to explain events without appealing to more than simple calculus.Nothing flashy. But you can obtain a good understanding of fractal dimensions, self iterating systems (like a Sierpinski gasket) and noise.

Ex Output:
Positive