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#!/usr/bin/env python3
VOWELS = set('aeiou')
def reverse_vowels(string):
''' Given a string reverse all the vowels (a, e, i, o, u) and return
resulting string.
>>> reverse_vowels('Raku')
'Ruka'
>>> reverse_vowels('Perl')
'Perl'
>>> reverse_vowels('Julia')
'Jaliu'
>>> reverse_vowels('Uiua')
'Auiu'
'''
string = string.lower()
indexes = []
cs = []
for index, c in enumerate(string):
if c in VOWELS:
indexes.append(index)
cs.append(c)
if len(indexes) < 2:
return string.title()
else:
characters = list(string)
for index in indexes:
characters[index] = cs.pop()
return ''.join(characters).title()
if __name__ == "__main__":
import doctest
doctest.testmod()
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