Difficulty: Easy
Write a function that takes a string as input and reverse only the vowels of a string.
Example 1:
Given s = "hello", return "holle".
Example 2:
Given s = "leetcode", return "leotcede".
def reverseVowels(self, s):
"""
:type s: str
:rtype: str
"""
vowels = ['a', 'e', 'i', 'o', 'u']
s = list(s)
begin = 0
end = len(s) - 1
while begin < end:
while begin < end and s[begin].lower() not in vowels:
begin += 1
while begin < end and s[end].lower() not in vowels:
end -= 1
s[begin], s[end] = s[end], s[begin]
begin += 1
end -= 1
return ''.join(s)