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: I bought 21 0z freeze dried liver. Half the container was filled with powder instead of pieces/chunks. I feel I was betrayed by the company. Hence I did not get what I paid for
Example Output: 3

Example Input: I was surprised to find out how weak this coffee is.  It has a good flavor but even on half cup it is very weak.
Example Output: 2

Example Input: I haven't seen these on the shelf for a while now so decided to buy here, although 12 boxes is a lot. They're great with butter and honey. Haven't tried them with anything else. They're very thin and fragile and so whatever you put on them will stand out.  But they still have a healthy taste.
Example Output:
5