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: This tea is ok but it's not nearly as potent as the original product that was available 5-10? Years ago.
Example Output: 3

Example Input: Go to Costco, and you can buy lower than this  price per oz. Currently $32 ($3 off regular $34.99)+ tax for big size = 0.83$/oz.  Besides, it is more convinient to return if you kid does not like this formula  Be careful, many times some sellers over price a product, and still make the product rank in the best sellers.
Example Output: 1

Example Input: I've tried a few other mixes for pancakes, and they've been awful, but this one is really good. I should buy stock in the co., because people will be buying this product I'm sure.
Example Output:
5