$2\mathrm{.}12$ LAB: Name format

Many documents use a specific format for a person's name. Write a program that reads a pe firstName middleName lastName $($in one line$)$ and outputs the person's name in the following format: lastName, firstInitial.middleInitial.

Ex: If the input is:

Pat Silly Doe

the output is:

Doe, P$.$S$.$

If the input has the following format:

first Name last Name $($in one line$)$

the output is:

lastName, firstInitial

Ex: If the input is: