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 ":".
A
national
housing
corporation
was
created
in
2015
.
A:O
national:O
housing:O
corporation:O
was:O
created:O
in:O
2015:O
.:O