58.Length of Last Word

class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        if len(s) == 0:
            return 0
        s = s[::-1]
        length = 0
        for i,v in enumerate(s):
            if v == " ":
                if length > 0:
                    return length
            else:
                length += 1
        return length