With no explanation, label each line with "O", "person-actor", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
film
starred
a
then
unknown
Natalie
Portman
in
her
first
film
role
.
The:O
film:O
starred:O
a:O
then:O
unknown:O
Natalie:person-actor
Portman:person-actor
in:O
her:O
first:O
film:O
role:O
.:O