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 ":".
Archeologists
are
excavating
the
site
.
Archeologists:O
are:O
excavating:O
the:O
site:O
.:O