LengthOfLastWord

class Solution {
public:
    int lengthOfLastWord(const char *s) {
        int n=strlen(s);
        int i=n-1,len=0;
        
        if (n==0)
            return 0;
        
        while (i>=0) {
            if ((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z')){
                len++;
                i--;
            }
            else if (len==0)
                i--;
            else if (s[i]!=' ')
                return 0;
            else
                break;
        }
        if (len>0)
            return len;
        else
            return 0;
    }
};