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 am training for a half marathon.  At the start of my training I wasn't taking cherry juice.  As I increased my long runs each week my knees and hips were so sore.  I started to take this cherry concentrate and ever since then I have felt pretty good.  I take the juice every morning with my breakfast.  It has a very strong flavor but mixes well with apple or orange juice.  The half marathon I'm running in is this weekend and I feel ready for it thanks in part to the cherry juice helping reduce the pain.  This stuff works for me.
Example Output: Positive

Example Input: Dynasty brand green tea is the best green tea I've ever tasted.  It never tastes stale, unlike brands I've bought in grocery stores.  This is because each tea bag is packed in a sealed envelope with a metallic lining.  The metal apparently keeps out moisture.
Example Output: Positive

Example Input: I expected Newman's Own dog food to be great.  It may be very nutritious, but my little terriers told me, "We are NOT eating this stuff.  Period.  No Way."  After 3 days they sniffed their bowls and walked away.  So I ordered another organic dog food (Natural Balance Organics) and it came today.  So, half old, half new, by the book, and they picked out the new stuff and left the Newman's in the bowl.  Go figure.  Just thought some of you might like to know.  I am switching them from Iams to something much healthier and I finally think I have a match.  But it's not Newman's.
Example Output:
Negative