Recently, craigslist has set up a phone verification to post ads on specific categories.
We are looking to have a program developed to automate this process.
The way it works now is. You must register an email address to post.
It then asks for a phone number to call you, it gives a pin number and you must enter it into cl to activate your account to post.
Your job is to figure out the algorythm craigslist is using and write a program that can take the inpur of the phone number and output the required craigslist pin.