You're enjoying learning programming so much, you've decided to run your own class teaching programming basics. You've got plenty of students signing up, and now you need to make logins for each of them. Since usernames (but not first names) have to be unique, you decide to write a program to help generate them. You should read in the classlist. txt which contains on each line. Your program should print out a list of usernames based on the following rules:

Username should be a students' first and, if applicable, middle name(s), with no spaces, converted to lower case.
If there already exists a student with that username, use their firstname plus first letter of last name converted to lower case.
If that already exists, use firstname plus first letter of lastname, plus a number, starting at 1 and counting up as required.