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 ":".
It
was
not
simple
and
clear
even
to
the
participants
.
It:O
was:O
not:O
simple:O
and:O
clear:O
even:O
to:O
the:O
participants:O
.:O