With no explanation, label each line with "O", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
was
a
professional
football
player
for
seven
years
,
seeing
action
with
the
New
York
Giants
,
Providence
Steamroller
and
Boston
Bulldogs
.
He:O
was:O
a:O
professional:O
football:O
player:O
for:O
seven:O
years:O
,:O
seeing:O
action:O
with:O
the:O
New:organization-sportsteam
York:organization-sportsteam
Giants:organization-sportsteam
,:O
Providence:organization-sportsteam
Steamroller:organization-sportsteam
and:O
Boston:organization-sportsteam
Bulldogs:organization-sportsteam
.:O