#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

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