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 got the sea salt and vinegar chips from Kettle.  I am used to the Salt and Vinegar chips in the white bag if I am allowed to say that.  Anyways, my first impression for this is wow at all the chips you get for the price.  I got the 9 0z x 12 bags and wow it is so many for the price.  You can tell they are high quality chips just from the packaging, also.  Well being used to the cheaper chips I wasn't expecting how mellow these things are.  The ones I am used to have a really sour taste to them which I didn't mind but they had tons of flavor.  These chips don't have any sour to them at all, and taste just like them but a lot less strong aftertaste.  If you want to try out Salt and Vinegar chips I suggest you try these out first.  So, for the price and how many you get, these chips are definately worth it.  They are thick and crunchy like the more expensive chips you get at high quality restaurants.  I recommend these, 4 stars.
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 received this product with an expiration date for last April. Didn't work well. The yeast didn't activate. I am very disappointed with this product.
Example Output:
Negative