本次比赛有两名出题人：menji 和 gyh20。你能辨别他们吗？

样例数据下载：https://119.27.163.117/download.php?type=problem&id=302

This contest has two problemsetters: menji and gyh20. Can you distinguish between them?

You can download the samples at https://119.27.163.117/download.php?type=problem&id=302