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 ":".
He
ordered
his
generals
to
terminate
Operation
Citadel
.
He:O
ordered:O
his:O
generals:O
to:O
terminate:O
Operation:O
Citadel:O
.:O