Length of Last Word

Given a string s consisting of words and spaces, return the length of the last word in the string.

A word is a maximal substring consisting of non-space characters only.

Example 1:

Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.

Example 2:

Input: s = " fly me to the moon "
Output: 4
Explanation: The last word is "moon" with length 4.

Example 3:

Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.

Constraints:

• 1 <= s.length <= 104
• s consists of only English letters and spaces ' '.
• There will be at least one word in s.

SOLUTION:

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