UVA622 Grammar Evaluation

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=8&page=show_problem&problem=563 [PDF](https://uva.onlinejudge.org/external/6/p622.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA622/585c05b8d07cec6f70df494a15b53ba79c22589b.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA622/9b198ca7b66508d1a316a7675c8928d51c690e66.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA622/e598dab516db27fc8b53ee4ad21c8db091f2d66b.png)