bash script simple (quick pay 5 stars) -- 2

I have 2 files that are from "aws s3 ls s://mybucket - if you need a listing perhaps ask me to attach one. In the two files that are lists of files! Each file should be each file, but not - need a program that looks that the 1st file and list the filenames that are not in the second the missing files? Please note there is hope we can mutually complete this task; we can leave each other nice comments and 5 stars for each? Been out of work; hope you can give me your best price for this small job, is $12 ok? if not how is the best price ? Please note project is due in two hours as this projects deadline, as this is needed asap from the time we start.