The Careful Librarian

The needed book is buried in the pile. The librarian narrates every single move while digging it out and restoring the rest. 🤓

You get the pile bottom to top and the book (exactly one copy). Print one line per move: off:<item> for each item moved to the side pile, take:<book> when the book comes off, then back:<item> for each item restored (in correct restore order).

Example:

Input: pile = ["atlas", "poems", "maps", "comics"], book = "poems" Output:

off:comics
off:maps
take:poems
back:maps
back:comics

comics and maps get lifted off (top-down) to reach poems, then they're placed back in reverse — maps first, then comics.