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

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

and outputs the person's name in the following format:

lastName, fir$$t$$nitial$.$middlelnitial.

Ex$.$ If the input is:

Pat Silly Doe

the output is:

Doe, P$.$S$.$

If the input has the following format:

firstName lastNam$($in one line$)$

the output is:

lastiName, firstinitial.

Ex$.$ If the input is:

Julia Clark

the output is$.$

Clark, J$.$