With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
the
early
1980s
,
as
a
promotion
,
McDonald
's
staged
an
in-house
rivalry
between
their
two
most
popular
products
.
In:O
the:O
early:O
1980s:O
,:O
as:O
a:O
promotion:O
,:O
McDonald:organization-company
's:O
staged:O
an:O
in-house:O
rivalry:O
between:O
their:O
two:O
most:O
popular:O
products:O
.:O