In this task, you're given a review from Amazon's food products. 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 or mixed, 4: good, 5: extremely good.

Example Input: These bars are just the right balance between the flavor of the coconut & the sweetness of the rice syrup. Unfortunately, although the expiration date is in 2013, about a third of mine went bad, or perhaps started life that way. They had a funny, metallic taste, & one even had some black substance on it, which may or may not have been mold. I'm wondering if refrigerating would have prevented this. I highly recommend these bars, but beware of the keeping quality!
Example Output: 3

Example Input: I have a recurring shipment of this product each month. Every month when the boxes arrive they are barely in one piece and VERY mangled. Last month one of the cases of water had to be repackaged before it arrived and it was a day late. I suggest using a more sturdy box for shipping. The water product is fine ... it's just the shipping packaging I have a problem with.
Example Output: 2

Example Input: I really like this hot chocolate mix. I was concerned, when I read some of the reviews, that I would not like it but I like it alot. To me it has just the right amount of chocolate and is not to sweet. I would recommend this product.
Example Output:
5