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: 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: there is a taste of sugar substitute, the aftertaste turns me off, I've even tried using a little bit of milk in the mug before hand to hide the taste. It didn't, so i'm just using Swiss miss powder and a little milk to make it a creamier hot chocolate before using using my keurig.
Example Output: 2

Example Input: These seemed like a great idea. I would be able to load up 50 k-cups with any type of coffee I chose, and still maintain the speed of using the store bought cups in my rush to get ready every morning. After waiting a month for this product to reach me (20 days before they even shipped it!) I finally found it on my doorstep.  Upon opening the box my hopes lifted even higher; these are solid little cups of a much higher quality than I expected. I filled one and snapped the lid down. I ensured it was sealed all the way around, placed it in my Kuerig, and hit the brew button. At first it seemed to be working splendidly then coffee began pouring out of places it isn't supposed to. By the time it was over I had quite a mess to clean up. Upon opening the Kuerig I found the DisposaKup completely in tact and the lid still secured properly. However the bit of overhanging filter was soaked, dripping, and HOT! I had discovered the source of the leak. I have tried again several times with the same reoccurring problem. I guess I should have bought the EcoBrew cup after all.  If you like the appearance of convenience, and the reality of spending more time cleaning up a mess this is the product for you.  (I went ahead and gave it two stars because I like the idea of the product so much.)
Example Output:
2