Why is my acronym generator wrong ? I don’t understand…

You haven't defined a. In your code you have defined acronym , but not a. You probably meant to type acronym , but messed up
To fix it:
change the print on the last line , and replace the a with acronym

Anyway , good luck!

You've used the expression

"print(f'Acronym of {user_input} is {a}')"

Where 'user_input' and 'a' are variables. In your current scope, user_input is a variable, however 'a' is not, so you get an error saying "name 'a' is not defined".

You should change {a} to {acronym} and it's going to work.