Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very different from the movie

I am a huge fan of the movie so I wanted to read the book it was based on. Because I had already seen the movie, it was impossible to not picture Sylvester Stallone and Brian Dennehy as the two main characters. The book differs from the movie in several ways, but its main difference is how the author focuses on the mental battle taking place inside the minds of the young war hero, fresh out of Vietnam, and the old police officer, who is also a war hero, but from the previous generation's war in Korea.The story starts off great, has some slow points, and then has a great ending. In a few chapters it was difficult to imagine what was happening because of the way the author describes the terrain, but I decided not to dwell on the inconsequential details and found the story to be just as entertaining as the film.