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 ":".
He
used
to
play
in
school
dramas
in
his
childhood
.
He:O
used:O
to:O
play:O
in:O
school:O
dramas:O
in:O
his:O
childhood:O
.:O