#!/usr/bin/perl -w
use strict;

my @sorted = map {$_->[0]} sort {
    $a->[0] cmp $b->[0] ||
    $b->[1] <=> $a->[1]
} map {[ $_ ,/(\w+)\s+(\w+)\s+(\w+)/]} <DATA>   ;
print  for @sorted;
    

__END__
2 4 a
1 9 b
6 8 a



##</code><code>##

my @sorted = map {$_->[0]} sort {
    $a->[3] cmp $b->[3] || # sorted ascending alpha on col 3
    $b->[2] <=> $a->[2]    # then sorted reverse num on col 2
} map {[ $_ ,/(\w+)\s+(\w+)\s+(\w+)/]} <DATA>   ;

print  for @sorted;