e345.py

class Solution:
    def reverseVowels(self, s: str) -> str:
        s = list(s)
        left, right = 0, len(s) - 1

        vowels = set('aeiouAEIOU')
        while left < right :
            if s[left] not in vowels :
                left += 1
                continue
            if s[right] not in vowels :
                right -= 1
                continue
            
            s[left], s[right] = s[right], s[left]

            left += 1
            right -= 1
            
        return ''.join(s)