Are All Seats Filled?

The puppet show can't start until EVERY seat is taken. 🎭

You get a list of seats, each taken or free. Print showtime if all are taken, or not yet if any seat is still free.

Example:

Input: seats = ["taken", "taken", "taken"] Output: showtime

Every seat says taken, so the all-taken flag never gets knocked down — print showtime.

Input: seats = ["taken", "free", "taken"] Output: not yet

The second seat is free, which flips the flag to False — print not yet.