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 ":".
Each
plane
had
a
black
profile
of
a
Wolf
's
head
painted
on
their
sides
.
Each:O
plane:O
had:O
a:O
black:O
profile:O
of:O
a:O
Wolf:O
's:O
head:O
painted:O
on:O
their:O
sides:O
.:O