Many documents use a specific format for a person's name. Write a program whose input is:

firstName middleName lastName

and whose output is:

lastName, firstInitial.middleInitial.

Ex: If the input is:

Pat Silly Doe

the output is:

Doe, P$.$S$.$

If the input has the form:

firstName lastName

the output is:

lastName, firstInitial.

Ex: If the input is:

Julia Clark

the output is:

Clark, J$.$

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