def sortstr(a):
	li=list(a)
	li.sort()
	a=''.join(li)
	return a

while True:
	n=int(input())
	if n==0:break
	li1=map(str,raw_input().strip().split())

	li2=[]
	for i in range(len(li1)):
		li2.append(sortstr(li1[i]))
#	print li2,li1
#	print len(li1),len(li2)
	for i in range(len(li1)-1,-1,-1):
		if li2.count(li2[i])>1:
			del li1[i]
	if len(li1)==0:
		print 'None'
	else:
		li1=map(int,li1)
		li1.sort()
		for i in li1:
			print i,
		print