Automated web testing using selenium help needed

Automated web testing using selenium help needed

I'm using selenium to test a web application but need some help. One of
the nodes that needs to be clicked has a constant changing value on
startup.
Example:
click css=#f0012 > ins.jstree-icon
On startup the letter before 0012 is randomly assigned (a letter from
a-z). This means each time my selemnium script is run, I need to somehow
obtain this character or just reference the 0012 so that the program knows
which button to click.
I'm really stuck on this so would appreciate any help