[j-nsp] set system root-authentication encrypted-password test

[juniper light]

hi all,
I need some help regarding authentication, by error when i tried to change
my password on M7i router, i did :
set system root-authentication encrypted-password test

of course i should put an encrypted password instead of a clair text passwd
"test"
and when i tried to log on the router again i cannot,

can you please help me in resolving this issue.

Thanks in advance ,

BR

Mounir