Write a function @regroup@ that receives as argument a string consisting of lower-case letters and digits, and returns a regrouping of the characters in the string. The regrouping is as follows: in the returned string, first there come the letters, in the same order as they came in the argument string; and next come the digits, in the same order as they came in the argument string.
Author: ProAl
Generation: 2026-01-25T16:42:14.577Z
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