UVA11988 破损的键盘 Broken Keyboard (a.k.a. Beiju Text)

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3139 [PDF](https://uva.onlinejudge.org/external/119/p11988.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11988/779b9109780c7300cba8fe4cbef1731b0d71cfe6.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11988/50c65506362bc565b866796ba56e914701ed0f24.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11988/775ca9d8e883eb169f2f1bd73b00e97dcfd52fc5.png)