If you find yourself having to log into various systems with long strange names and usernames that aren't your own, check into ~/.ssh/config. Adding a Host block for each system you need to log into will give you a short name to use as well as let you set the user (and various other things - check out man ssh_config):

Host cs
  HostName cs.really.long.name.example.com
  User mrxinu

At this point you can type ssh cs and log right in.