Use prompt function to ask user entering his/her name in the format below.

LastName, FirstName MiddleInitial.

Check user's information is in the right format. 
If not, ask him/her to enter again until he/she gets it.

After you get the right format, display what user entered.

Use search and substring functions (hint) to extract user's last name and first name separated.
Display two sentences about user's last name and first name.