TypeError: sort() takes no positional arguments

['A', 'AA', 'AAA', 'B', 'BB', 'BBB', 'CC']

NameError: name 'reversed' is not defined

['CC', 'BBB', 'BB', 'B', 'AAA', 'AA', 'A']

['CC', 'B', 'BB', 'BBB', 'A', 'AA', 'AAA']