Complex mathematics

User: ". . . It's still not taking my new password.
Geis: "New passwords must be six to eight characters long. . . "
User: "It is."
Geis: "It must contain both letters and numbers. . . "
User: "It does."
Geis: "It cannot contain common words. . . "
User: "It doesn't."
Geis: "And it must be something you haven't used before."
User: "I haven't. . . and it's still not working."
Geis: "How many characters ARE in your password."
User: "Seven letters and two numbers."
Geis: "That's nine. Passwords can have no more than EIGHT characters."
User: "Oh. . . " *click*