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 ":".
Its
grand
opening
was
held
six
days
later
.
Its:O
grand:O
opening:O
was:O
held:O
six:O
days:O
later:O
.:O