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
has
a
vital
role
in
maintaining
national
security
with
thorough
surveillance
and
patrol
from
the
air
.
It:O
has:O
a:O
vital:O
role:O
in:O
maintaining:O
national:O
security:O
with:O
thorough:O
surveillance:O
and:O
patrol:O
from:O
the:O
air:O
.:O