The "y" key is broken on my keyboard - admin password has that letter

Question

I've tried copying and pasting the password into the admin password box but it won't allow me to do that. I am asking this on my netbook. My admin password has the letter Y in it and I can't type it in to allow the app store to do the upgrade to mavericks. I worked around the same problem with my apple ID by logging in via windows netbook and changing it. 
I don't know anyone near me with a mac desktop machine... I cannot afford a new keyboard right now and it is just the Y key and the number 6 key that stopped working when water splashed on it.
Is there no way to reset the admin password? Why won't it allow me to copy and paste it? I can find the letter Y in something else and copy it but it won't allow me to paste it in that way.
Ideas? I mean... if no one knows any backdoor way of resetting the **** thing I can try posting to local groups to borrow or rent a keyboard but it seems pretty stupid. It's a common thing to end up with one key that doesn't work or the cap gets broken... and on laptops it's common to get stuff stuck under keys or to try cleaning underneath and end up with the little mechanism broken. Surely there ought to be a way to reset the admin password in this sort of case... I mean, what if you just can't remember it anyway? Is there no way to change it?
I don't even really want mavericks but it won't stop nagging me and I'm sick of it. I also can't update other software because of same issue.
any help appreciated.

Answer 1

OS X Mountain Lion: Reset a login password
Scroll down to Resetting the original administrator account password. Try the procedure under reset your user password with your Apple ID.
If that does not work for whatever reason you can also use the following technique:
Restart your Mac while holding down the ⌘ and R keys at the same time until you see the OS X Recovery screen.
From the menu bar at the top, select Utilities > Terminal.
In the Terminal window type resetpassword and press Enter. A window will open behind Terminal that looks like this
Select your startup volume ("Macintosh HD" in the above screenshot), choose your user account from the dropdown selection, enter a new password, complete the password hint field, and click Save.
You may then see a confirmation dialog explaining how this change affects Keychain Access and what to do about it. Remember it or write it down, then click OK.
Quit Reset Password
Quit Terminal
Quit OS X Utilities and restart your Mac.
To fix your Keychain problems, go to your Utilities folder and open Keychain Access. Follow the steps here: Mac OS X: Keychain Access asks for keychain "login" after changing login password.
It will be a challenge to do anything with your Mac given an inoperative input device. Brand new USB keyboards are available for less than $10, and are often simply thrown away in the trash along with virus-ridden PCs. Any USB keyboard will work.