class Solution:
    def lengthOfLastWord(self, s: str) -> int:
        length = 0
        i = len(s) - 1
        while i >= 0 and s[i] == ' ':
            i -= 1
        while i >= 0 and s[i] != ' ':
            length += 1
            i -= 1
        return length

sol = Solution()
print("Output is :- ",sol.lengthOfLastWord("Hello World"))
print("Output is :- ",sol.lengthOfLastWord("   fly me   to   the moon  "))
print("Output is :- ",sol.lengthOfLastWord("luffy is still joyboy"))

Output is :-  5
Output is :-  4
Output is :-  6