while True:
try:
s = list(map(int, input().split()))
gs = s[0]
sc = s[-1]
kt = s[1]
s = s[2:-1]
lb = [kt] # 结果初始值为第一个
for i in range(0, len(s) - 1, 2):
x = s[i]
y = s[i + 1]
# 判断是不是末尾,末尾直接加
if lb.index(y) == len(lb) - 1:
lb.append(x)
# print('mowei = ' + str(lb))
elif lb.index(y) == 0: # 判断在首位
lq = [lb[0]]
lh = lb[1:]
lb = lq + [x] + lh
# print('shouwei = ' + str(lb))
else:
y_index = lb.index(y)
lq = lb[:y_index + 1]
lh = lb[y_index + 1:]
lb = lq + [x] + lh
# print('qita = ' + str(lb))
# print('zuizhong = ' + str(lb))
# 得到链表,开始删除
lb.remove(sc)
print(' '.join(map(str, lb)))
except:
break