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 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: This tea has NO flavor, tastes like dust It "looks" like quality -- pretty package -- but it's no good. Lipton regular Pekoe is farrr superior.
Example Output: 2

Example Input: It has an interesting texture that most people might find to be off-putting. Plus, as far as bars go, it is not all that filling. It also leaves your mouth feeling sort of chalky and full of oat kernels.
Example Output:
3