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: Arrived in 6 days and were so stale i could not eat any of the 6 bags!!
Example Output: 1

Example Input: Very difficult to work with - tends to turn to solid rock even when following directions - taste is less than desirable
Example Output: 2

Example Input: If you want a good quick cooked sauce without excess acidity these are the ones to use. The real San Marzano, beware of imitators!
Example Output:
5