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 ":".
C.
R.
Gregory
saw
it
in
1883
.
C.:O
R.:O
Gregory:O
saw:O
it:O
in:O
1883:O
.:O