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 ":".
Night
firing
was
also
impractical
.
Night:O
firing:O
was:O
also:O
impractical:O
.:O