Create a Sage Cloud account and start a project called (Your Name) Coding Theory Homework. Invite mc (swisherh@gmail.com) to collaborate with you on the project. Start a Sage Worksheet in your project and write in that worksheet either a function that calculates the ISBN-10 check digit given a list containing 9 digits as input, or a function that calculates the ISBN-13 check digit given a list containing 12 digits as input. If you are not familiar with python syntax, I highly recommend the Code academy course on python (https://www.codecademy.com/learn/python, it's really fun and helpful