while 1:
try:
raw = [int(s) for s in input().split()]
num, head, dd = raw[0], raw[1], raw[-1]
one = list()
for i in range(2, len(raw) - 2, 2):
one.append((raw[i + 1], raw[i]))
linkList = [head]
for o in one:
index = linkList.index(o[0])
linkList.insert(index + 1, o[1])
linkList.remove(dd)
print(' '.join([str(i) for i in linkList]))
except:
break

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