题解 | #查找兄弟单词#

while True:
    try:
        words = input().split()
        n = int(words[-1])
        word = words[-2]
        words = words[1:-2]
        ans = []
        for c in words:
            if len(c) != len(word) or c == word or sorted(c) != sorted(word):
                continue
            ans.append(c)
        ans = sorted(ans)
        print(len(ans))
        print(ans[n-1])
    except:
        break