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 love this popcorn. Only downside is the shipping and packing. Cost almost as much as the popcorn. Need to pack it better. Bag split and a bunch of loose popcorn falling out of the box when the guy brought it to my door.
Example Output: 5

Example Input: Horrible "hemical" taste.Extremely salty !!!!!!  This was a complete waste of money,after the first bag I will have to throw the whole box away !!!!!!!!
Example Output: 1

Example Input: This is  terrible popcorn! No taste, poor popping ratio. and the size OMG! I popped this Gourmet popping corn in front of a party, everyone busted out in laughter!
Example Output:
1