题解 | #从单向链表中删除指定值的节点#

line = input().split()
li = [line[1]]
opts = line[2:-1]
for i in range(0, len(opts), 2):
    try:
        pos = li.index(opts[i])
        li.insert(pos+1, opts[i+1])
    except ValueError:
        pos = li.index(opts[i+1])
        li.insert(pos, opts[i])
li.remove(line[-1])
li.reverse()
print(' '.join(li))