题解 | #查找兄弟单词#

while True:
    try:
        list = input().split()
        list1 = []
        for i in list:
            if i != list[-2] and ''.join(sorted(i)) == ''.join(sorted(list[-2])):
                list1.append(i)
        print(len(list1))
        list1.sort()
        print(list1[int(list[-1]) - 1])
    except:
        break