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
went
on
to
be
Chief
of
the
Air
Staff
in
2000
before
retiring
in
2003
.
He:O
went:O
on:O
to:O
be:O
Chief:O
of:O
the:O
Air:O
Staff:O
in:O
2000:O
before:O
retiring:O
in:O
2003:O
.:O