leetcode 917. Reverse Only Letters

https://leetcode.com/problems/reverse-only-letters/description/

Reverse Only Letters - LeetCode

 

class Solution:
    def reverseOnlyLetters(self, s: str) -> str:
        s = list(s)
        left, right = 0, len(s) - 1
        while left <= right:
            if s[left].isalpha() and s[right].isalpha():
                s[left], s[right] = s[right], s[left]
                left += 1
                right -= 1
            elif not s[left].isalpha():
                left += 1
            elif not s[right].isalpha():
                right -= 1
 
        return(''.join(s))

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