Deaf Grandma

This small challenge comes from Chris Pine's "Learn to Program". Ensure that you read everything and click every link before starting the work.

Premise

Write a program which can imitate a Grandma who's hard of hearing and follows these constraints:

• If you don't input anything (just hit enter) she responds with WHAT?!

• If you ask a question with any lower-case letters, she responds with SPEAK UP, KID!

• If you talk to her in all upper-case letters, she responds with NO, NOT SINCE 1946!

• The first time you say GOODBYE! she says LEAVING SO SOON?

• The second time you say GOODBYE! she says LATER, SKATER! and the program exits.

Example

HEY KID!
> hi, grandma
SPEAK UP, KID!
> I SAID HI, GRANDMA
NO, NOT SINCE 1946!
>
WHAT?!
> Goodbye!
SPEAK UP, KID!
> GOODBYE!
LEAVING SO SOON?
> GOODBYE!
LATER, SKATER!