Given a string `s` consisting of some words separated by some number of 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`.