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 ":".
They
left
the
promotion
in
1980
.
They:O
left:O
the:O
promotion:O
in:O
1980:O
.:O