What’s a good shorthand for "save and exit" in a text based software

I've made a script/software of sorts that is used to analyse test results of our patients.

Currently, to save your results, you have to enter 27, which was due to me having a brilliant idea at the time and decided it would be wise to have it so it's auto defined from the number of tests in the software. So, 26 tests, 26+1=27.

I'm trying to get it to standards, as I'm adding the ability to define custom tests. And such, the number shifting across devices won't do.

What's a good shorthand for a save command? Possible options I came up with so far: "-s" "s" "sav" "save" "se" (save and exit)

I don't think one letter command would be viable as it's easy to mistype and prematurely save and exit the program.

I'm leaning towards "se" since it's short, requires two letters and yet could be typed with one hand.