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class Solution(object):
    def lengthOfLastWord(self, s):
        cnt=0
        leng=len(s)
        if s==" ":
            return 0
        else:
            while leng>0:
                if (s[leng-1]==" " and cnt==0):
                    leng-=1
                else:
                    if s[leng-1]==" ":
                        break
                    else:
                        cnt+=1
                        leng-=1
        
        return cnt
        """
        :type s: str
        :rtype: int
        """