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

Ex Input:
Worked like a charm all over England. I haven't tried the other adaptors, but I found my MacBook to work just like it does here in the US, and there was no difficulty plugging into the outlets.

Ex Output:
Positive

Ex Input:
This is not a typical Adam Sandler movie, which is not necessarily a bad thing, but it kind of is here. First of all it's not funny. It's about "comedy" but I wouldn't consider the movie itself to be a comedy, although there are a few funny things in it I suppose. This movie seems like it's all over the place. It has a long runtime but it doesnt really accomplish much. Some people might like the story, but it was pretty dull to me.

Ex Output:
Negative

Ex Input:
This book is very detailed, technical and complex. If you're seriously considering exploring the photogravure technique on copper, this book is a must. It tells you everything you will ever need and all the complicated steps in the process. However, there are few historical or contemporary photogravure reproductions which is why this book gets only a four star rating from this reviewer. If you are seriously considering the photogravure process as one you would like to explore, I recommend starting with solar plates rather than copper. It is much less complicated and toxic. A very good resource is "Printmaking in the Sun" (2001) by Dan Welden, inventor of this method.

Ex Output:
Positive