UVA13072 Duckindromes

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=866&page=show_problem&problem=4970 [PDF](https://uva.onlinejudge.org/external/130/p13072.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13072/b610619cf2be874161a8c0bf6c7d3d173b5a5bb1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13072/b1ffb2d450ddde4c7b07b22ff473ab314510c6e1.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA13072/e7cd2b5904818db1949888fa0cec5fa4806cfa1d.png)