The { $a cmp $b } comparison is the default behaviour for sort so doesn't have to be mentioned specifically if you don't wish. You can populate your @A and @trash arrays in one go by eliminating the intermediate @sorted array and pushing onto the appropriate array using a ternary (see Conditional Operator).
$ perl -Mstrict -Mwarnings -E'
> my @notSorted = qw{ Beep Ape Circus Arg };
> my( @A, @trash );
> push @{ $_ =~ m{^A} ? \ @A : \ @trash }, $_ for sort @notSorted;
> do {
> local $" = q{, };
> say qq{@A};
> say qq{@trash};
> };'
Ape, Arg
Beep, Circus
$
I hope this is helpful.
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