题解 | #查找兄弟单词#

while True:
    try:
        from collections import Counter
        list1 = input().split(' ')
        # print(list1)
        n = int(list1[0])
        list2 = list1[1:n+1]
        x = list1[n+1]
        k = int(list1[n+2])
        dict1,dict2,list3 = {},Counter(x),[]
        # print(list2,x,k)
        for i in list2:
            dict1 = Counter(i)
            # print(dict1)
            if dict2 == dict1 and i != x:
                list3.append(i)
        if len(list3) == 0 or len(list3) <= k:
            print(len(list3))
        else:
            list3 = sorted(list3,reverse=False)
            print(len(list3))
            print(list3[k-1])
    except:
            break