use strict;

my %dataset;

while (<>) {
   # $_ => Id, Loc, Value, Etime

   my ($id, $loc, $value, $etime) = split(/,/, $_);

   $dataset{$id}{$etime} = { "Value" => $value,
                             "Loc" => $loc,
                           };
}

foreach my $id (sort keys %dataset) {
   foreach my $etime ( 
                       sort {
	                  my ($loc_a, $head_a) = $dataset{$id}{$a}{Loc} =~ /S(\d+)H(\d)/;
			  my ($loc_b, $head_b) = $dataset{$id}{$b}{Loc} =~ /S(\d+)H(\d)/;
   
			  if (($head_a <=> $head_b) == 0) {
			     $loc_a <=> $loc_b;
			  }
			  else {
			     $head_a <=> $head_b;
			  }
		       } 
		       keys %{$dataset{$id}}
		    ) {

      my $loc = $dataset{$id}{$etime}{Loc};
      my $value = $dataset{$id}{$etime}{Value};

      printf(STDOUT "%2s, %6s, %.1f, %i\n", $id, $loc, $value, $etime);
   }
}