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
the
oldest
serving
senator
,
as
he
was
appointed
at
a
time
when
appointments
to
the
senate
were
for
life
.
At:O
the:O
time:O
,:O
he:O
was:O
the:O
oldest:O
serving:O
senator:O
,:O
as:O
he:O
was:O
appointed:O
at:O
a:O
time:O
when:O
appointments:O
to:O
the:O
senate:O
were:O
for:O
life:O
.:O