The Countdown Check

Rocket launches need a proper countdown — every number lower than (or equal to) the one before. 🚀

You get the control room's list of nums. Print liftoff if it never goes UP, otherwise abort.

Example:

Input: nums = [10, 9, 8, 8, 3] Output: liftoff

It never goes up (10≥9≥8≥8≥3) — print liftoff.