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 ":".
In
the
game
,
a
new
alien
force
threatens
Earth
.
In:O
the:O
game:O
,:O
a:O
new:O
alien:O
force:O
threatens:O
Earth:O
.:O