Only some advise here, as you have to make this work yourself. Don't use characters that mean something in a Unix shell lien !, $, &, *, <,>,?, and maybe a few more. Also be aware that you didn't press the caps-lock key.
There must be a difference in what you have type initially when you assigned the 1st passwd to root in MySQL and during the install. Sorry, but it has nothing to with ISPConfig. You could try before installing ISPConfig if you can login to MySQL by using:
If you can succesfully login, the start the installation of ISPConfig.
PS: Use exit to leasve mysql.