UVA10557 XYZZY

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=17&page=show_problem&problem=1498 [PDF](https://uva.onlinejudge.org/external/105/p10557.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10557/4129704b15735f7beba3969786ed8fc6b341d675.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10557/cef0a15d77f601e7ababed21cb1634367bcf37f1.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10557/bf7a5f6b67f2dd99b7e174d6f9a6a2e2a4c91ae8.png)