my @array = ( -15, 991, -9, 980, 1, 911, 281, 1299, 870, 1205, 1, 1 );
@array = sort { $a <=> $b } @array;
print "@array\n";
__END__

-15 -9 1 1 1 281 870 911 980 991 1205 1299