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

Input: Consider Input: Needed place for kids to sleep while visiting grandma and now they argue over who gets to sleep on the air mattress. Both think it's more comfy than their bed at home.Would have given 5 stars, but the bag it comes with to put it in is worthless, no chance of ever getting it in there again.

Output: Positive

Input: Consider Input: Who would buy it not knowing what is on it, is there any new material, is there a better version of music than previously released, how many, etc., etc. You've got to tell us something - give us a reason to buy it - give us a few short pieces to listen too! King indeed; he's pretty good but the King has been dead awhile (notwithstanding the occasional phantom sighting) and the remaining living creators of original rock and roll - Jerry Lee Lewis and Chuck Berry are very much alive and touring and in Jerry Lee's case still recording great music.I'll take a look at buying this if I can see and hear what it is!Jimp.s. sorry for the 1 star but ...

Output: Negative

Input: Consider Input: Timothy Hutton plays a Science Fiction author who, although he has written many novels, is best known for his first book about a song that haunted him. The song returns with a vengeance in the film and it is up to him to find a way to stop it from killing others. This was a nice tight thriller with fine acting by Hutton and David Kelly who may be familiar from Charlie and the Chocolate factory or Waking Ned Devine. It kept me guessing until the end (which is fairly hard to do). The background of beautiful Mediterranian locations make this a great movie to help escape from the summer heat.
Output: Positive