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

[EX Q]: An exellent study of the German Airforce from the fall of Sevastopol in the Crimea to its failure at Stalingrad. Very well written, with a clear analysis of the events. Well worth the money and it belongs in every major collection on World War II's Eastern Front.
[EX A]: Positive

[EX Q]: I bought this air mattress to use while my new bed was being shipped from back east, the bed lost air every night and I woke up almost on the floor. I tried to send it back but it was impossible to get back into the box.
[EX A]: Negative

[EX Q]: This is what is in the dictionary under wack. I can't belive that this many people bought this (...) The hot boys are just a fad like bellbottoms. (...) If you think this is what rap is about u just plain stupid and I'm glad this hot boy stuff is almost over wit. When some of my friends play this crap in the car I just rather get out and walk.
[EX A]:
Negative