class Solution
{
public:
    int lengthOfLastWord(string s)
    {
        int size = s.size() - 1, len = 0;
        while (size >= 0 && !((s[size] >= 'a' && s[size] <= 'z') || (s[size] >= 'A' && s[size] <= 'Z')))
            size--;
        while (size >= 0 && ((s[size] >= 'a' && s[size] <= 'z') || (s[size] >= 'A' && s[size] <= 'Z')))
        {
            size--;
            len++;
        }
        return len;
    }
};