$ perl -Mstrict -Mwarnings -E '
open my $inFH, q{<}, \ <<EOD or die $!;
ws.abc.dsfsfsfwerfrwef std 13232
ws.dfsdferferfregregrgr std 99868 Y
ws.abc.asddwefewfewfewf std 45345
fwfrwfrefergegregerefds std 36754 Y
ws.abc.fferfergregrfreg std 45435 
EOD

my @streams;
my @spaces;

while ( <$inFH> )
{
    my @flds = split;
    push @{ $flds[ -1 ] eq q{Y} ? \ @streams : \ @spaces },
       $flds[ 0 ];
}

say qq{@streams};
say qq{@spaces};'
ws.dfsdferferfregregrgr fwfrwfrefergegregerefds
ws.abc.dsfsfsfwerfrwef ws.abc.asddwefewfewfewf ws.abc.fferfergregrfreg
$