UVA11999 Unlock

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=229&page=show_problem&problem=3150 [PDF](https://uva.onlinejudge.org/external/119/p11999.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11999/e806b984051e0e7dab0120090628d4ccbae834f0.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11999/fd79c27716664ecffa73246df8759ef754e69bf4.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA11999/3c9d3152c68c50cccdd1d400ab9091ed7328dc78.png)