UVA991 Safe Salutations

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=11&page=show_problem&problem=932 [PDF](https://uva.onlinejudge.org/external/9/p991.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA991/146acc95e815d4d191071f0660e8b0ea0c385e0a.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA991/a019471d774ee1fc599188c2b2a40524712de376.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA991/ed8f063c962bcd27abd9f417a8cfbe920ca4fdb7.png)