UVA10921 Find the Telephone

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=21&page=show_problem&problem=1862 [PDF](https://uva.onlinejudge.org/external/109/p10921.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10921/4873f4d269a0365d01a91961fb382e61337a1431.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10921/8e26d0676760b7878cce8b3ba9fc0fe1b85bf1bc.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA10921/b4254cf383f3ecadbfc4c84d979af8542c543b83.png)