题解 | #查找兄弟单词#

# -*-coding:utf-8-*-

while True:
    try:
        str_ = input().split(" ")
        str_num = int(str_[0])
        str_list=[]
        for i in range(1,str_num+1):
            str_list.append(str_[i])
        s_n=0
        s_n_list =[]
        m_str = str_[-2]
        m_str_num = int(str_[-1])
        for s_l in str_list:
            if len(m_str) == len(s_l):
                if(s_l != m_str) and (sorted(s_l) == sorted(m_str) ):
                    s_n_list.append(s_l)
                    s_n+=1
        print(s_n)
        s_n_list.sort()
        print(s_n_list[m_str_num-1])
    except:
        break