Please read this: https://docs.codewars.com/training/training-example

The description states:

The function will take an input list with the sequence of the program instructions and will execute them.

Input program is alreeady a list of commands. You don;t need to split.

Your solution does not handle input correctly, it's not a kata issue.

Please read the info in the link I posted and you'll see what's wrong with your code. Last bullet point there. And mark your post as having spoiler content next time when posting code like that.

Read this: https://docs.codewars.com/training/troubleshooting#expected-the-same