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 ":".
His
music
videos
also
feature
actors
before
they
became
famous
.
His:O
music:O
videos:O
also:O
feature:O
actors:O
before:O
they:O
became:O
famous:O
.:O