Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Input: Consider Input: What am I reviewing here... this gizmo or the supplier, Eforcity? I never received this product after my order! After waiting and waiting I contacted Eforcity several times -- no reply. After a nasty letter from me Eforcity'r reply feigned lacking information about my mailing address!What a cop-out.I told them I would not pay for it, so Eforcity said they'd give me a refund, which has not come to me yet. I bought another product to replace this from Amazon which arrived quickly from Amazon.

Output: Negative

Input: Consider Input: After reading all the great reviews on this product on Amazon, I decided to go for this. I don't typically have good results from diet products, but I figured I'd give it a shot. I've been taking these for 3 weeks, as directed, and I might as well have been taking sugar pills for all the more this is doing for me. I felt like my appetite increased, I haven't lost any weight at all - in fact I've been fluctuating up and down 3 pounds for the past couple of weeks. I gave this two stars because I didn't feel the anxiety or sleeplessness that some people complained about, but I'm still disappointed. I was hoping I'd find something that actually worked!

Output: Negative

Input: Consider Input: If the human condition under extraordinary circumstances interests you, then this book is a must. It's kind of a non-sequitur in the context of the whole Asian saga, but I found it to be absolutely captivating, and a couple of the main characters make a later appearance in Noble House.
Output: Positive