UVA12947 Texting with Grandma

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=862&page=show_problem&problem=4826 [PDF](https://uva.onlinejudge.org/external/129/p12947.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12947/f92d6ad396c13292336a29ee444262d128237ba0.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12947/1d3347b69926c42bfcdd20de95e8e2a08b65ae7c.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12947/301217287f6578ae3f0af63514306a7f52dd96a2.png)