题解 | #查找兄弟单词#

while True:
    try:
        s = input().split(" ")
        n = s[0]
        k = int(s[-1])
        x = s[-2]
        sdli = s[1:-2]
        sli = []
        for i in sdli:
            tags = 0
            if len(x) != len(i) or x == i:
                continue
            for j in x:
                if x.count(j) == i.count(j):
                    pass
                else:
                    tags = 1
                    break
            if tags == 0:
                sli.append(i)
        sli.sort()
        print(len(sli))
        print(sli[k-1])

    except:
        break