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 ":".
Trough
systems
convert
the
heat
from
the
sun
into
electricity
.
Trough:O
systems:O
convert:O
the:O
heat:O
from:O
the:O
sun:O
into:O
electricity:O
.:O