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()