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 ":".
The
fire
occurred
during
the
morning
rush
hour
,
with
300
passengers
having
just
alighted
from
an
eastbound
train
.
The:O
fire:O
occurred:O
during:O
the:O
morning:O
rush:O
hour:O
,:O
with:O
300:O
passengers:O
having:O
just:O
alighted:O
from:O
an:O
eastbound:O
train:O
.:O