题解 | #查找兄弟单词#

while True:
    try:
        s=[n for n in input().split()]
        n=int(s[0])
        a=s[1:-2]
        target=s[-2]
        k=int(s[-1])
        # print(n,a,target,k)
        count=0
        output=[]
        for i in a:
            if i==target:
                continue
            elif sorted(i)==sorted(target):
                count+=1
                output.append(i)
        output.sort()
        
        print(count)
        print(output[k-1])
    except:
        break