题解 | #查找兄弟单词#

while True:
    try:
        num_and_words = input().split()
        num = int(num_and_words[0])
        words = num_and_words[1:len(num_and_words)-2]
        x = num_and_words[-2]
        k = int(num_and_words[-1])
        new_x = list(x)
        new_dic = {}
        for i in x:
            if i not in new_dic:
                new_dic[i] = 1
            else:
                new_dic[i] += 1
        new_list = []
        for i in range(len(words)):
            new_dic1 = {}
            for j in words[i]:
                if j in new_dic1:
                    new_dic1[j] += 1
                else:
                    new_dic1[j] = 1
            if new_dic1 == new_dic and words[i] != x:
                new_list.append(words[i])
            else:
                continue
        sorted_new_list = sorted(new_list, key = str.upper)
        print(len(new_list))
        print(sorted_new_list[k-1])

    except:
        break