题解 | #查找兄弟单词#

a=input().split()
b=list(a[-2])
sum=0
tag=0
mm=[]
for i in a[1:-2]:
    ff=b[:]
    c=list(i)
    for k in c:
        #print(22222222)
        if (len(c)==len(b)) and (i!=a[-2]) and k in ff:
            tag=1
            ff.remove(k)
        else:
            tag=0
            break
    if tag==1:
        sum+=tag
        mm.append(i)
print(sum)
if len(mm)>=int(a[-1]):
    print(sorted(mm)[int(a[-1])-1])