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

Ex Input:
Does a great job highly visible. Works well with the different fencers that I use in the different pastures. Last a long time. Can't beat it for the price.

Ex Output:
Positive

Ex Input:
Great book for people that need to write email. It would be nice to review the grammar rule's from time to time.

Ex Output:
Positive

Ex Input:
Once you get past the hype, you will realize this device is a [$] clock. When you press the button on the e-marker, it only records the time, not the radio station. When you download the information to your computer and connect to the website it looks for the song that was played on the station how many hours/days ago you pressed the button. If you selected the wrong station you will get a different song.If you use the scan button on your radio, this product is not for you

Ex Output:
Negative