Each record is (name, city). Write cities(records) that returns the different cities as a sorted list.
cities([['Asha', 'Pune'], ['Ravi', 'Delhi'], ['Om', 'Pune']]) → ['Delhi', 'Pune']
cities([]) → []
Submit runs 4 tests, including hidden edge cases.
Each hint gives a little more help. Try on your own first.
Run your code to see the output here.