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
boys
walked
to
the
church
from
their
dormitory
to
practice
twice
each
day
.
The:O
boys:O
walked:O
to:O
the:O
church:O
from:O
their:O
dormitory:O
to:O
practice:O
twice:O
each:O
day:O
.:O