Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.
If the last word does not exist, return 0.
Note: A word is defined as a character sequence consists of non-space characters only.
For example,Given s ="Hello World",return5.

public class Solution {
    public int lengthOfLastWord(String s) {
        String s1 = s.trim();
        if(s1.length()<1)
           return 0;
        int count = 0;
        for(int i=s1.length()-1;i>=0;i--)
            if(s1.charAt(i)==' ')
               break;
            else
               count++;
        return count;
    }
}