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 ":".
At
the
time
he
was
working
as
a
partner
in
a
service
agency
for
attorneys
.
At:O
the:O
time:O
he:O
was:O
working:O
as:O
a:O
partner:O
in:O
a:O
service:O
agency:O
for:O
attorneys:O
.:O