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

Ex Input:
This book was brand new when I received it. However, it did not arrive for 20 days after I ordered it.

Ex Output:
Negative

Ex Input:
I used this program for my science class. My students loved it! They learned some interesting facts, saw damage from earthquakes we talked about in class and never once did I hear that it was boring! Can't beat that!

Ex Output:
Positive

Ex Input:
Like them. Very lite and comfortable. Dry. I'm a now-and-then day-hiker and had only worn them once in the woods. There was a problem of soreness under the top, inside gromets on both boots. Got a suggestion of re-stringing the top gromets from my daughter-in-law, and it worked when I wore them all day running around locally. Suggest including some alternative stringing techniques in shoe boxes.

Ex Output:
Positive