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
had
not
been
active
in
politics
since
retiring
from
public
life
in
1923
.
He:O
had:O
not:O
been:O
active:O
in:O
politics:O
since:O
retiring:O
from:O
public:O
life:O
in:O
1923:O
.:O