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 ":".
An
official
grand
opening
was
held
on
December
3
,
2016
.
An:O
official:O
grand:O
opening:O
was:O
held:O
on:O
December:O
3:O
,:O
2016:O
.:O