Definition: Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Input: I was hopeful this mattress would work out, having read mixed reviews, but as others stated, the mattress held air for only several days before it started losing air during the night. My son would then have to turn the air pump on (during the night) in order to have be able to have a comfortable night of sleep. Generally speaking I think all air mattresses do the same thing, as I then purchased one from the local K-mart, which is also going back tomorrow for the same problem.
Output:
Negative