need Debian default password

[Shankar Dutt]

hello list,
i installed debian OS (Linux version 2.6.18-5-486)
and now it prompting :

Debian GNU/Linux 4.0 demohost tty1
demohost Login:

I tried many combination of user name  and password but could not do login

what is the default username and password ?

thanks
shankar
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