UVA520 Append

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=7&page=show_problem&problem=461 [PDF](https://uva.onlinejudge.org/external/5/p520.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA520/6052bd6c208bee271ced53936b3a56c706919cde.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA520/f2d331fa4f0fb96d64ae82c24e2c3286b985c919.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA520/bade4594b9f077348afd6eb9d1c1a976be3d228c.png)