I am having trouble understanding homework.

[Shaunayvette82]

hey I realized late that there is more than one way to make the string to the new inputs

Try this

male_names = { 'Oliver', 'Declan', 'Henry' }
name_to_remove = input()
name_to_add = input()

male_names.remove(name_to_remove)

male_names.add(name_to_add)

print(male_names)