#! perl
use strict;
use warnings;
use Data::Dump;

my %HoA_sequence =
(
    67 => 'A',
    68 => 'S',
    77 => 'W',
    78 => 'P',
    79 => 'I',
);

$HoA_sequence{$_} //= '-' for 67 .. 79;

dd \%HoA_sequence;