I can't login on the server after installation.

I installed mariadb server version 10.4.11 and after install the server I can't login on the server. In the instructions I got after execute mysql_install_db said that I can login as root using sudo mysql I tried several times and always is telling me that is not possible login using root without password.

I have an iMac with mac OS Catalina installed.
I installed the server using brew.

In the attached images you can see the instruction and after start the server how I try to connect to the server and the server response.