class Solution(object):
    def findWords(self, words):
        """
        :type words: List[str]
        :rtype: List[str]
        """
        q = set("qwertyuiop")
        a = set("asdfghjkl")
        z = set("zxcvbnm")
        map = {}
        for c in q:
            map[c] = 0
        for c in a:
            map[c] = 1
        for c in z:
            map[c] = 2
        res = []
        for word in words:
            i = -1
            for c in word:
                if i == -1: i = map.get(c.lower())
                if i != map.get(c.lower()):
                    i = -1
                    break
            if i != -1:
                res.append(word)
        return res