题解 |

while True:
    try:
        nums = input().split(' ')
    except:
        break
    num_node = nums[0]
    head = nums[1]
    res = [head]
    nodes_back = nums[2:-1:2]
#     print('nodes_back:',nodes_back)
    nodes_fore = nums[3:-1:2]
#     print('nodes_fore:',nodes_fore)
    node_to_del = nums[-1]
    for node_back,node_fore in zip(nodes_back,nodes_fore):
        res.insert(res.index(node_fore)+1,node_back)
    res.remove(node_to_del)
    print(' '.join(res)+' ')