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

Ex 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.

Ex Output:
Negative


Ex Input:
While old and out of print, this book is a very good way to learn the basics of photography. You have to ignore most of the references to digital cameras as the technology has changed a lot.

Ex Output:
Positive


Ex Input:
The physics department at my school gets the mad ramblings of this man, and I usually end up with them (seeing as how no one else will read them). In a word, I sum these writings as "nonsense." Most of his ideas, aside from being mostly incoherant and physically absurd, also defy the time-tested and true concepts that the average high-school physics student could debunk. Furthermore, mixed in with these insane babblings, are religious and political ramblings, which he tries to pass off as the only possible truth.My recommendation, unless you want a good laugh or evidence of the under-education of many Americans, pass on this book. Any other use of your money would be a better one.

Ex Output:

Negative