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 recently been on a low carb diet, as I find that I can no longer tolerate even natural sugars like agave, honey, and dates. These raise the blood sugar which spikes the insulin, a hormone whose message is "store fat!" Insulin also causes the kidneys to retain water and therefore I would bloat from a high carb diet.  My dilemma is that I love sweets--and now it is not a problem, thanks to products like stevia, a natural plant that has safely been used in parts of the world as a sweetener for hundreds of years. It has no calories and no impact on the blood sugar (although for some people there might be a bit, as the brain is tricked into thinking it is getting sugar). Stevia used to be legal in the USA only as a cosmetic product because of politics: companies that made low calorie sweeteners such as aspartame did not want competition. Yet, aspartame gave me headaches and even sometimes symptoms of multiple sclerosis. So I would use stevia at times, but the aftertaste was bad--and to be honest, I wasn't too crazy about the "during taste" either.  Then I tried NuNaturals. This product is awesome and like no other stevia I have tried. It is not only delicious but also has no aftertaste (unless you put in way too much--a common mistake by people new to this). It comes in tablets and in powdered form (in a bottle or handy packets with individual servings). It also comes in alcohol-free liquid form and even in vanilla flavor. Unlike aspartame (which becomes even more toxic when heated) stevia can be used in baking. NuNaturals has a stevia baking blend just for that. (Since I am a raw fooder, I can't tell you how it tastes, but I am sure it is good, judging by their other products.)  Thanks to these great products, I can do a low carb raw diet but not be deprived of my sweets!
Example Output: Positive

Example Input: wE LOVED THIS POPCORN  BUT COME ON  SHIPPING IS WAY OVER THE TOP  WE WOULD SETTLE NEXT TIME FOR SOMETHING WE CAN BUY BUT NOT SPEND 3 TIMES ON SHIPPING
Example Output: Negative

Example Input: these are grossly overpriced.  It is a package of three boxes but when you take into account that they are a dollar of two per box than they should be, you then have to pay for shipping.  Sorry, I would skip them.  My local grocery store carries them and a box is anywhere from 2.98 to 3.49 each.  Although these are healthier than some other cookies, you still have to watch the fat, sugar and salt contents.  Whole foods are much better for you but in a moment or two of indulging, these fit the bill.  Just the price on this site is ridiculous!  Ask your grocer to start carrying them.
Example Output:
Positive