UVA11475 Extend to Palindrome

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=26&page=show_problem&problem=2470 [PDF](https://uva.onlinejudge.org/external/114/p11475.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11475/ae37dadabf3a354b162ed1c713805d6b078797e1.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11475/4d2d2ef490382ca953209c6068aedc5d2dd678ba.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11475/dd218972587d925ba462f27c3ea37bb9bb3b2e1c.png)