I thought it was too easy, then I thought it was wrong. Now I see that this will take a bit more thinking.

Welcome to the new age of a.i. ^-^

You're welcome!

Ah, yes. I see. Thanks!

ask chatGPT or an a.i.

I wish I understood how this works

It's every element with an odd index. See now how that way of saying it could be confusing?

That was a good one. I guess I'm a bit rusty on logic because this racked my brain for a bit longer than it should have.

Agreed. I thought I knew what it wanted, but I'm not getting the answers right

Thanks, I get it now. Boy was I barking up the wrong tree here

AFAIK:
"())(()))" the case at hand
"())  (()))" seperated into contained groups
so the second group has a length of 4

In your example in the details, why is "())(()))" supposed to return 4? That looks like 6 to me ( reduces to "()(())" ). Are double sets (()) not counted as two sets (4 characters)?

Love the Wallace and Grommit art!