With no explanation, label each line with "location-GPE", "building-other", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
K3
is
also
now
kept
at
the
Royal
Observatory
,
Greenwich
.
K3:O
is:O
also:O
now:O
kept:O
at:O
the:O
Royal:building-other
Observatory:building-other
,:O
Greenwich:location-GPE
.:O