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 ":".
A
large
passenger
train
with
over
1,200
people
on
board
rolled
backwards
down
a
hill
into
a
slow
moving
goods
train
,
killing
281
people
.
A:O
large:O
passenger:O
train:O
with:O
over:O
1,200:O
people:O
on:O
board:O
rolled:O
backwards:O
down:O
a:O
hill:O
into:O
a:O
slow:O
moving:O
goods:O
train:O
,:O
killing:O
281:O
people:O
.:O