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 are great little snack packs - flavorful chips and fairly low fat and low cal.
Example Output: 4

Example Input: My dog loves, loves  this dog food.I had to say love twice, because this dog food is one of his dog's favorite.
Example Output: 5

Example Input: I have used this oil for several years and it is the best for eating with bread or cooking,  I love the regular, I use it on everything. You won't be sorry you tired it, great for dipping bread and cooking omelet, and green beans.
Example Output:
5