Two clubs need one list of shared members and another of people signed up only for the morning. Transfer the visitor demo to two groups; use sorted() only for display since set order is not guaranteed.
This is a separate exercise. Edit main.py, press Run to inspect the output, then Submit to check the numbered tasks.
Run to inspect the sorted results, then Submit.
morning to a set of names from morning_names.shared to the intersection of morning and the evening names.morning_only to the difference of the morning and evening names.