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

Example Input: This DVD is one of my all time favorite musical DVDs. Miss Jackson proves why she is the highest paid singer in the industry. With a combination of costume changes, great choreography, Janet's greatest hits, and a sold out crowd at Madison Square Garden, the DVD makes for an excellent night of entertainment. I only regret that I was not able to see the concert in person here in my home town due to a cancelation of the concert;however, the DVD is definately a suitable substitute. I highly recommend this DVD to any fans of Janet, lovers of music, and owners of quality DVDs.
Example Output: Positive

Example Input: I was looking for a shower door that could open from either the left or the right and I did not want one to choose for me. This door ticks and fits all the right boxes in that department. I like the crystal glass effect too. It is very clear and allows a lot of light into the shower hub. It is frameless too which is what was asked for by the wife.Its sturdy quarter of an inch thick glass also is a nice feature. But most of all the pivot door is a feature I got on with too.
Example Output: Positive

Example Input: It's disappointing to say the least. I'm not sure what Suzzette Phillips is talking about in her review, but on my version the classic album rumors isn't on my dvd. (And nowhere on the disc or packaging does it say the album is contained on the disc. Possibly, there are two versions? Anyway, 75 minutes of interviews about each song, and vintage footage each lasting about 15 to 30 seconds. Nothing new is on here that you haven't seen on any other documentary. It would be great if they played the vintage live selections in their entirety.
Example Output:
Negative