With no explanation, label each line with "O", "organization-sportsleague", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
On
August
17
,
he
hit
first
MLB
home
run
.
On:O
August:O
17:O
,:O
he:O
hit:O
first:O
MLB:organization-sportsleague
home:O
run:O
.:O