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

Example Input: Needed place for kids to sleep while visiting grandma and now they argue over who gets to sleep on the air mattress. Both think it's more comfy than their bed at home.Would have given 5 stars, but the bag it comes with to put it in is worthless, no chance of ever getting it in there again.
Example Output: Positive

Example Input: This is not a new book;perhaps that's why it is so useful.There is no gobblygook, no arcane economic theories with fancy lables.What there are in this book are many examples of - - if the government takes this action to make this or that happen, the unintended consequences have proven to be and will probably be again something quite different, and usually not positive.Sound experiential economics in my view, clearly written; and a tremendous help to understanding what will probably happen if the nation takes on more debt, subsidizes this or that interest, taxes one interest at the expense of another, etc.I liked it; I could read and understand it.
Example Output: Positive

Example Input: Product works perfectly with jawbone 2. Ease of use without needing to change anything on ear peice. Will need to decrease volume when using the nanda ear gel. Getting good fit easy with the differen sizes provided. Soft material makes comfortable for extended use , and no need for the ear loop.
Example Output:
Positive