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

Example Input: I picked up Hard Times preparing to enjoy it since Charles Dickens is my favorite author. While not going so far to say that I was disappointed,I will say that it was the first Charles Dickens novel that I almost felt like not finishing. Not only is the plot rather humorless, but the characters are charmless and almost uninteresting. If it hadnt been written by Dickens then I may have liked it better but as it was it did not have any of Dickens usual charm and humor.
Example Output: Negative

Example Input: I have just spent 5 minutes trying to get this damn printer to print an envelope without mangling it. Wonderful.
Example Output: Negative

Example Input: I do not write reviews typically but this product changed my life! My periods have always been irregular, however I still did not expect them to just stop when I was 25.. I suffered the mental agony of never getting periods unless I took Provera when I decided enough was enough. The wise Internet came to my rescue and convinced me that Vitex could be the solution. I started taking this product once a day (first thing in the morning) for 120 days (2 boxes) with a gap of 2 days when I forgot to pack it on a business trip. During those 120 days, I got 5 periods (spotting, very light to light flow). Then I decided to give myself a week's break... and got my full fledged period. So, so thankful! If your doctor says everything's okay with you (yeah, right) BUT you just need Provera to get your period and fertility treatments to have children, I HIGHLY recommend you try this product. Just give it time to work. Good luck!
Example Output:
Positive