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 ":".
The
commander
of
the
unit
was
known
as
Air
Wing
Chief
initially
.
The:O
commander:O
of:O
the:O
unit:O
was:O
known:O
as:O
Air:O
Wing:O
Chief:O
initially:O
.:O