Given the task definition, example input & output, solve the new input case.
Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Example: I've read this book with much expectation, it was very boring all through out the book
Output: Negative
Review writer does not like the book because it was boring, therefore it is a negative review.

New input case for you: These once cost nearly $3000, but I got my z557 for about 1/15th of that. I've had it for over six months and used it for radio, TV, DVD movies, Internet video (full-screen HD) and general computing. With 2GB of RAM and Vista Ultimate, it actually runs really well. My keyboard isn't as bad as what was written about, here, but it is not the kind of keyboard you would use for more than surfing, anyway. And, it will take any USB keyboard or keyboard/mouse, wireless, or otherwise. I'd recommend using a wired LAN instead of its weak wireless. And, it can seem like it's running hot, but that hasn't turned out to be a problem. If you have the room, it's a decent all-around system, looks good and is nicely built.
Output:
Positive