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 ":".
The
company
began
to
focus
on
domestic
markets
and
retreated
from
international
electricity
markets
.
The:O
company:O
began:O
to:O
focus:O
on:O
domestic:O
markets:O
and:O
retreated:O
from:O
international:O
electricity:O
markets:O
.:O