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
worked
as
mayor
until
2013
.
He:O
worked:O
as:O
mayor:O
until:O
2013:O
.:O