```
Title Description
You need to maintain a data structure to support the following three operations:
* $L$$id$: insert a numbered $id$item on the left side of the current sequence.
* $R$$id$: inserts an item numbered $id$on the right side of the current sequence.
* $? $$id$: there are several elements on the left side of the point, and several elements on the right side, and min output.
Input and output format:
Input format:
The first line, an integer $q$, represents the operand.
The following $q$line, 2 numbers per row, represents an operation.
Output format
For each "?" Operation, output one line and one integer, indicating the answer.
```
by 阿柒 @ 2018-10-13 11:03:44