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 is good coffee, but nothing to write home about.  I like the grind, which is finer than most ground coffee, although I prefer grinding the beans myself.  It has a bold, but not bitter, taste.  Even though I'll stick to Eight O'Clock as my coffee of choice, this one certainly isn't objectionable and is better than most cups you'll get at the diner.  And it's certainly better than Folgers, MH, and other grocery store brands.
Example Output: 3

Example Input: For those who love salt and vinegar potato chips, this is the one to choose. The flavor is zippy and tart, with no unpleasant chemical aftertaste like the less "natural" versions of this snack. The 2-ounce bags are just right to share at lunch. The chips are a little greasy, and that's why I've given them 4 stars instead of 5.
Example Output: 4

Example Input: Kettle brand chips are probably the best potato chips I've tasted thus far. They are thick, has a bite to them and I love their creative flavors. My favorite Kettle chip happens to be the honey Dijon. I think it's a great combination sweet, salty and tangy, perfect for one of those snack attacks when you don't know exactly what you want. I especially love the curled up chips for extra texture and crunch. These 2-oz bags are perfect for anyone who has a problem controlling portions (like me!).
Example Output:
5