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 ":".
On
the
field
,
the
Red
Sox
had
some
success
during
this
period
,
but
were
unable
to
return
to
the
World
Series
.
On:O
the:O
field:O
,:O
the:O
Red:organization-sportsteam
Sox:organization-sportsteam
had:O
some:O
success:O
during:O
this:O
period:O
,:O
but:O
were:O
unable:O
to:O
return:O
to:O
the:O
World:O
Series:O
.:O