题解 | #查找兄弟单词#

import sys
#判断是否兄弟单词
def checkXD(word, x):
    if len(w) != len(x) or w == x:
        return False
    if sorted(word) == sorted(x):
        return True
    return False

while True:
    try:
        ss = input().split()
        n = int(ss[0])
        words = ss[1: n + 1]
        x = ss[n + 1]
        k = int(ss[n + 2])
#         print(n,words,x, k)

        xiwords = []
        for w in words:
            if checkXD(w, x):
                xiwords.append(w)

        xiwords.sort()
        print(len(xiwords))
        #如果越界,就不输出
        if k <= len(xiwords):
            print(xiwords[k - 1])

    except:
#         print(sys.exc_info())
        break