1 question
You are given a string s, which consists of several words separated by some space characters before and after the words. Returns the length of the last word in a string.
A word is the largest substring that consists only of letters and does not contain any space characters.
Example 1:
输入：s = "Hello World"
输出：5
Example 2:
输入：s = " fly me to the moon "
输出：4
Example 3:
输入：s = "luffy is still joyboy"
输出：6
hint:
1 <= s.length <= 104
s contains only English letters and spaces ' ' and
there is at least one word in s