My first instinct was not even to write any code. Using a half decent text processor and Chrome, both things I always have open, you can solve this in like 10 seconds. Copy message. Open tab. Paste. Search "(", write down occurrences. Search ")", write down occurrences. Paste into Chrome address bar(defaults to Google, which acts as a calculator).
You get the answer without wasting any brainpower.
Do you think this would work, or do you think the pool of potential players is too small?
I'm sure you could find enough people to participate.
Especially interested in knowing if this is something you personally would like.
Sounds fun to me. Whether I'd have time is a whole different question.