#P1453. [Wc]Dface双面棋盘

[Wc]Dface双面棋盘

Description

Input

Output

Samples

![](https://darkbzoj.cc/JudgeOnline/images/1453_4.jpg)
![](https://darkbzoj.cc/JudgeOnline/images/1453_5.jpg)

Limitation