58. Length of Last Word.java

class Solution {
    public int lengthOfLastWord(String s) {
        int length = 0;
        int tail = s.length()-1;
        while(tail >= 0 && s.charAt(tail) == ' ') {
            tail--;
        }
        while(tail >= 0 && s.charAt(tail) != ' ') {
            length++;
            tail--;
        }
        return length;
    }
}