题目：

题解：

func findWords(words []string) (ans []string) {
    const rowIdx = "12210111011122000010020202"
next:
    for _, word := range words {
        idx := rowIdx[unicode.ToLower(rune(word[0]))-'a']
        for _, ch := range word[1:] {
            if rowIdx[unicode.ToLower(ch)-'a'] != idx {
                continue next
            }
        }
        ans = append(ans, word)
    }
    return
}