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 ":".
This
raid
was
planned
in
secret
.
This:O
raid:O
was:O
planned:O
in:O
secret:O
.:O