输入
```
([(][([]]]()
```
输出
```
()
```
应为
```
[]
```
by Wf_yjqd @ 2022-12-29 13:33:42
@[songjiahao_](/user/761125)
by Wf_yjqd @ 2022-12-29 13:37:21
@[Wf_yjqd](/user/526094) 谢谢，我看看
by SJH_qwq @ 2022-12-29 13:54:48