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

Ex 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!

Ex Output:
Negative

Ex Input:
This was the biggest waste of money ever created. If you want to know the song that much, call the station and ask them, they don't mind, really.

Ex Output:
Negative

Ex Input:
Before "Foundation" i'd read somes short-storys from Asimov, so i become insterested in his style. And what can i say now about this book? Really is a excelent piece of scifiction: Asimov united 4 independent stories in a book with lifely descriptions, a strong main-story and credibles characters in incredibles situations,...the result is just epic. So, with this book we become in eyewitness on the monumental development and fall of the human civilization... becoming it in a surrounding journey trought our future and past.

Ex Output:
Positive