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.

Example Input: I can't believe this book does not get more reviews. I have lots of books and programs to try to learn Spanish. This and Spanish with Paul are the two best that I've come across
Example Output: 5

Example Input: Good thermal qualities but the material is too stiff. They don't hang well at all. Very disappointed but will serve there purpose for the rest of the Michigan winter.
Example Output: 1

Example Input: The battery arrived and looked as described and was a great value for the money. The only issue encountered was the terminal used to connect the battery to the iPhone was slightly longer than the original equipment battery. I had to make a slight bend in the battery's terminal post to ensure a proper fit.
Example Output:
4