Instructions: In this task, you're given a review from Amazon. Your task is to generate a rating for the product on a scale of 1-5 based on the review. The rating means 1: extremely poor, 2: poor, 3: neutral, 4: good, 5: extremely good.
Input: The concept is fantastic, but by the end of the book I was just plowing through it to finish it, not because I was interested in the story any longer.
Output:
3