Regroup 5

Write a function @regroup@ that receives as argument a string consisting
of mixed-case letters, and returns a regrouping of the characters in the
string. The regrouping is as follows: in the returned string, first
there come the lower-case letters, in the same order as they came in the
argument string; and next come the upper-case letters, in the same order
as they came in the argument string.

Sample session

Problem information

Author: ProAl

Generation: 2026-01-25T14:08:21.297Z

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