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

Input: Consider Input: I'm sure the information presented in this class is good, but the presentation set my teeth on edge. Sheri thinks she is funny when she talks in a screeching voice and makes fun of new mother's foibles in her "funny stories". I cringed every time I heard her squeal as a pretended mother with a problem. If you can get past her, then I guess the DVD can give you the information and techniques you need for Lamaze. But unfortuanately Sheri spends more time talking or shrieking while trying to be amusing than just giving the information you would like to hear.

Output: Negative

Input: Consider Input: This is the story of the brother of one of the secondary characters from the Leopard Lord. Farris is sold as a slave by his stepfather. Claimed by two very different gods, his fate will be decided on what he does with his life. Will he be ruled by vengeance and violence? Or will his love of the animals he tends lead him to a different choice? Ms Morland's characterization is excellent, the plotting is much improved (from good to even better). If I had a complaint, it would be that this book did not sweep me into a different world the way that the very best speculative fiction does. However, that said, it was a most enjoyable read, and I'll buy her next book, too.

Output: Positive

Input: Consider Input: I have seen four 3D movies on my new 3D TV and this one has been the least exciting as far as its 3D effects. I was disappointed. I am amending this review after watching the movie again. While I did enjoy the 3D version, I felt the 3D effects were subpar. It is still enjoyable to watch and still has the 3D perspective. They don't send things protruding out at you like other 3D movies do. It doesn't have the WOW-factor that other 3D movies have had.
Output: Negative