Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Complete the recursive call so trace(3) prints the seven lines for the descent to 0 and the return back to 3. The "up n" line must print after the recursive call returns.

down 3
down 2
down 1
stop
up 1
up 2
up 3