Greasy Fork

Need help making simple userscript

I need help making a script that'll click an input box and type in a set variable, hit tab to go to the next input box and type in a number starting at 0000, hitting enter, then if incorrect hit "back/backspace" and go back to the screen and typw in the set variable again then tab then number: 0001, and then keep continuing from there 0000-9999, one number increment at a time, 0000, 0001, 0002, 0003, 0004, 0005.... so on to 9999, or until the combination is correct. if anyone can help me message me on skype: live:thewidower96, or email me! araitz9047@gmail.com

This seems like a brute force attack.

Wait -- is this the FBI trying to break into an iPhone?

(Just kidding.)