UVA10701 Pre, in and post

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=19&page=show_problem&problem=1642 [PDF](https://uva.onlinejudge.org/external/107/p10701.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10701/a09c3bf96dbfed3a03b50ae009c08ef9e1479c76.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10701/500cd92ce2280fdd3fbcd83945f08fc0fabe34ec.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10701/657cd6728fdccd12ba0c6b04a364e9247a9b0949.png)