题解 | #查找兄弟单词#

# 存储x中字符个数
import copy

x_dict = {}

# 存储所有找到的兄弟节点
sbling_list = []

m_n, x, k = input().rsplit(" ", 2)
n = m_n.split(" ")[1:]

# 初始化x_dict字典
for ch in x:
    if x_dict.get(ch):
        x_dict[ch] += 1
    else:
        x_dict[ch] = 1

def is_sbling(astr:str):
    if astr == x:
        return False
    tmp_dict = copy.deepcopy(x_dict)
    for ch in astr:
        ch_count = tmp_dict.get(ch)
        if ch_count and ch_count > 0:
            tmp_dict[ch] -= 1
        else:
            return False
    if sum(tmp_dict.values()) == 0:
        return True

for word in n:
    if is_sbling(word):
        sbling_list.append(word)

sbling_list.sort()
sbling_len = len(sbling_list)
print(sbling_len)
if sbling_len >= eval(k):
    print(sbling_list[eval(k)-1])