(lintcode)422. Length of Last Word

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class Solution {
public:
    /**
     * @param s: A string
     * @return: the length of last word
     */
    int lengthOfLastWord(string &s) {
        // write your code here
        int res = 0;
        for(int i = 0; i < s.size(); i++){
            if(isalpha(s[i])){
                res++;
            }
            else{
                res = 0;
            }
        }
        return res;
    }
};