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 ":".
Dog
saliva
has
been
reported
to
complicate
the
healing
of
ulcers
.
Dog:O
saliva:O
has:O
been:O
reported:O
to:O
complicate:O
the:O
healing:O
of:O
ulcers:O
.:O