58. Length of Last Word

class Solution {
public:
    int lengthOfLastWord(string s) {
        int count=0; 
        bool flag=false; 
        for (int i=s.length()-1; i>=0; i--) { 
            if ((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')){ 
                flag=true; 
                count++; 
            } 
            else { 
                if(flag==true) 
                    return count; 
            } 
        } 
        return count;
    }
};