Ubuntu password length is too short or too simple to solve

When installing Ubuntu, the account Sai was created. I want to change the password to two letters AA for easy input.

Operation terminal

[email protected]:~$ passwd sai

Change Sai’s password.

(current) UNIX password: XX

Enter the new UNIX password: AA

Re enter the new UNIX password: AA

You must choose a longer password

Enter new UNIX password: 1234567

Re enter the new UNIX password: 1234567

Bad: new password is too simple

Enter a new UNIX password:

Green is manual input. What should I do? Add Su permission to execute. Do this:

Scheme 1:

[email protected]:~$ sudo passwd sai

[sudo] password for sai:  xxx

Enter the new UNIX password: AA

Re enter the new UNIX password: AA

Passwd: password successfully updated

Scheme 2:

[email protected]:~$ su

Password: Super

[email protected]:/home/sai# passwd sai

Enter the new UNIX password: AA

Re enter the new UNIX password: AA

Passwd: password successfully updated

[email protected]:/home/sai#

success!