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

Example Input: Well another one of my first dvd purchases...I found this concert very poor...it did nothing for me... the sound quality was poor, The set on stage was quite good but lacked the final sparkle, Janet's performance was glitzy... but sadly something was missing...my advice is puchase Janet's later DVDS...
Example Output: Negative

Example Input: With the type of closures and the amount of compression it is meant to give it's really difficult to put on. You need a hand to pull it closed in order to actually be able to close each of the 20 some odd hooks.
Example Output: Negative

Example Input: I was troubled over what to get my son for Christmas this year but when I came across this jigsaw I knew my search had come to an end. This jigsaw will help him cope with the stresses of being a modern day 4 year old surrounded by electronic stimuli 24-7. You can't go wrong with Melissa & Doug!
Example Output:
Positive