Keyboard Row

主要是要写的简洁

class Solution(object):
    def findWords(self, words):
        """
        :type words: List[str]
        :rtype: List[str]
        """
        a, b, c = set('asdfghjkl'), set('qwertyuiop'), set('zxcvbnm')
        result = []
        for word in words:
            tmp = set(word.lower())
            if tmp & a == tmp:
                result.append(word)
            if tmp & b == tmp:
                result.append(word)
            if tmp & c == tmp:
                result.append(word)
        return result