use strict;
use warnings;
use Data::Dumper;

my %data = (
A => { A => 5,  R => -2, N => -1 },
R => { A => -2, R => 7,  N => -1 },
N => { A => -1, R => -1, N => 7 },
);

my @keys = sort keys %data;

print ' ';
printf "%4s" => $_ for @keys;
print "\n";

for my $row (@keys) {
    print $row;
    printf "%4s" => $data{$row}{$_} for @keys;
    print "\n";
}

exit;