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
two
locomotives
operated
for
a
week
at
a
time
.
The:O
two:O
locomotives:O
operated:O
for:O
a:O
week:O
at:O
a:O
time:O
.:O