题解 | #查找兄弟单词#

while True:
    try:
        data = input().split()
        # print(data)
        n = int(data[0])
        k = int(data[-1])
        key_word = data[-2]
        word_list = []
        for word in data[1:-2]:
            count = 0
            #注意不要再循环word判断是否是key_word的兄弟单词，这样复杂度会很大，使用sorted(word) == sorted(key_word)直接判断即可
            if word != key_word and sorted(word) == sorted(key_word):
                word_list.append(word)
        # print(word_list)
        if len(word_list) >= k:
            print(len(word_list))
            #注意不要提前在外定义，否则len(word_list) < k无法定义
            print(sorted(word_list)[k-1])
        else:
            print(len(word_list))

    except:
        break