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: I have a 2 1/2 year old 60 pound German wirehair pointer.  We feed this food during hunting season due to his increased metabolic needs.  He burns so many calories, he eats 8 cups of this food a day (with zeal).  We use the large bites to help keep the tarter and plaque off of his teeth (and to slow his eating).  Due to the high quality of this food, he can keep up his energy, keep his weight up, and recover more quickly from scrapes/bumps from running the field.  Our vet's exact words were, "Your dog is an example of perfect health."  You may think the price on this food is high, but it is worth it.  You get what you pay for.  Also, consider the canned version of this food.  It is a nice way to feed/hydrate a dog after a long day hunting - just give them an hour to settle down first.  On a side note, we feed Diamond Naturals Beef and Rice in the off season.  We have no digestive issues transitioning from one to the other (we switch over a period of a few weeks).
Example Output: Positive

Example Input: This tea has a smoky undertone to the flavor. All three cans had the same smoky flavor.  Other than that the tea was fine.
Example Output: Negative

Example Input: This stuff really works for preventing cramping during the middle to latter stages of your rides. Pop 1 into each water bottle and you're set. Flavor is fine and goes down easy.
Example Output:
Positive