def trans(m):
    a=list(str(m))
    a.sort()
    b="".join(a)
    return b

while True:
    n=int(input())
    if n==0:
        break
    s=list(map(int,input().split()))
    s1=list(map(trans,s))

    s2,i=[],0
    while i<len(s1):
        if s1.count(s1[i])==1:
            s2.append(s[i])
        i=i+1
    s2.sort()

    if len(s2)==0:
        print("None")
    else:
        for m in s2:
            print(m,end=" ")
        print()