Based upon your data you can use a GRT something like:

#!/usr/bin/perl
use warnings;
use strict;

print
    map unpack( 'x3 a*', $_ ),
    sort
    map pack( 'n a a*', /(\d+)([A-Z])/, $_ ),
    grep /\S/,
    <DATA>;

__DATA__

K-2-D-10A
K-2-D-10C
K-2-D-10D
K-2-D-10E
K-2-D-10F
K-2-D-10G
K-2-D-11A
K-2-D-11B

K-2-D-12I
K-2-D-12J

etc.
etc.
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