You have two problems.
Replace my @less, @equal, @greater, @answer;
with
my @less;
my @equal;
my @greater;
my @answer;
Replace unshift(@answer, @equals);
with unshift(@answer, @equal);
That will result in a decreasing sort being returned.
I suggest you religiously specify use strict;. The problems were trivial to fix because they were specifically reported.
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