With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
But
there
is
no
true
polar
night
in
December
.
But:O
there:O
is:O
no:O
true:O
polar:O
night:O
in:O
December:O
.:O