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
retired
at
the
end
of
the
2009
season
.
He:O
retired:O
at:O
the:O
end:O
of:O
the:O
2009:O
season:O
.:O