How to implement phone number input mask in woocommerce?

Question

PHP

Good day, dear experts!
I ask for your advice:
In woocommerce, on the checkout page, in the phone number entry point, I want to implement a mask like: +7(___)-__-__-___ (by default), so that no other characters other than numbers are entered.
But the problem is that I can't figure out which file to edit and what to write.