Each stdin line is a name Surname, Given names possibly with trailing whitespace. Rewrite it to Given names Surname, preserving the trailing whitespace. Lines not matching <x>, <y> are output unchanged.
Costner, Kevin Augustus · → Kevin Augustus Costner ·
(· marks a preserved trailing space.) Concrete layout pinned here (exam source had only a digest).
Python only. From COMP2041/9044 — adapted for autotest.