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.