ncrack does not work

[notooth1]

I failed to crack my own account which has 1 character password. What did I do wrong?

$ ncrack -vv --user notooth localhost:22

Starting Ncrack 0.7 ( http://ncrack.org ) at 2021-10-14 00:55 +07

Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
ssh://127.0.0.1:22 finished.


Ncrack done: 1 service scanned in 1232.94 seconds.
Probes sent: 1199 | timed-out: 0 | prematurely-closed: 359

Ncrack finished.