The problem is quite simple. You have to login to a machine and read the content of a file on that system. Then you need to paste the content here or upload the file, the same way you submit your code.

File : /home/hacker-weekly/abacus

So, you have to read the file '/home/hacker-weekly/abacus' and submit the file content here.

If you haven't got your login credentials, get it by clicking on the button 'Get Login Credential' below. Then you can login into the machine by running following command:

ssh "your-username"@"server-addr"

Hint: Think all about file permission in a UNIX-based system.