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 ":".
It
is
typically
three
years
in
length
.
It:O
is:O
typically:O
three:O
years:O
in:O
length:O
.:O