What language are you using for Advent of Code this year?

I've been working through The Rust Programming Language (https://doc.rust-lang.org/book/title-page.html) in preparation for this year's Advent of Code. I've been meaning to learn Rust for some time, and I want to use my winter break (I'm a professor) to make some small Rust projects in preparation for a larger side project involving operating systems design that I want to do in Rust.

Common Lisp or Python, keeping it simple. I've tried using AOC as a motivator to use a new language, but it's never been effective. Though this year with only 12 days maybe I'd make it all the way through with a different language. Usually I start in CL + something, and the something gets dropped after a few days.