You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Example Input: Don't know much to say except they smelled funny upon opening the bag and neither of our 2 dogs would go anywhere near them.
Example Output: Negative

Example Input: Arm & Hammer's baking soda is aluminum free, they just don't write it on their packaging.  I wasn't sure so I called them and they said there is no aluminum in it, and they would have to state it if there was because people take the product internally.  This leads me to believe that there just isn't aluminum in baking soda.  And researching it showed me that there might have been in the past, but not anymore and not for a long time.  I resent that Bob's Red Mill writes "Aluminum Free" on their package and then charges a premium for their product.  It's also arsenic free, I hope.  If they label it "Arsenic Free" will we assume other brands aren't?  I don't like that kind of marketing.
Example Output: Negative

Example Input: I have a rescued greyhound and he was doing great on Canidae until we got our last order just last month.  Now he's a mess digestively.  I'm on an email discussion group for greyhounds and have seen lots of complaints as well as confirmation that the formula has changed.  Definitely not working for my dog anymore.  Also be aware that these used to be 40 lb. bags for the same price they now sell a 35 lb. bag for.  I know everyone's hurting financially, but I think in this case the dogs got sold down the river for a few bucks.  Disappointing.
Example Output:
Negative