Formit - ban or hook by word - how to do it?

Question

MODX

Good day.
There is a standard Formit in Modex for sending messages.
Lately they've been spamming like hell and trying to get in all the time...
How to make some kind of hook with a check for the word "print" for example?
So that if there is this word in the form fields, the message is not sent or redirected to the "fuck" page
I'm really looking forward to a detailed answer with an example!
Thank you.