UVA831 Document Validator

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=10&page=show_problem&problem=772 [PDF](https://uva.onlinejudge.org/external/8/p831.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA831/3b3860e1aaadd81d2111e516ba3906ab0b290f37.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA831/c54794a66456c74156482972d87055f31bfa73bd.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA831/2e36e27d4aa7f87bc6828da9282fc205b266977e.png)