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

Ex Input:
At 80" iong, this is an extra long twin, not a standard twin. Consequently I had to take back the sheets I bought, as they were 5" too short. I would have ordered a different model had I known that 80" wasn't standard. It's easier just to replace the sheets and I don't have time to send the bed back.

Ex Output:
Negative


Ex Input:
While old and out of print, this book is a very good way to learn the basics of photography. You have to ignore most of the references to digital cameras as the technology has changed a lot.

Ex Output:
Positive


Ex Input:
This is one of the best Barbra has ever done, I have listened to it in full probably ten times since last week when I bought it. It is so incredible. I am waiting for the day that this is out in DVD to see her in action while I listen to her. God has truly blessed her with unbelievable talent.

Ex Output:

Positive