Letters before numbers

[remissao]

I should first say that I'm glad this project exists and I'm impressed with the progress that has been made.

I hope caligator can become a real open source alternative to soulver (https://soulver.app), once it gets some of the same advanced features.

However, I think first of all, I'd like to see the ability to type before and after a math operation. Currently it only works if I type after the operation: