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 ":".
Retail
sales
certainly
point
in
that
direction
.
Retail:O
sales:O
certainly:O
point:O
in:O
that:O
direction:O
.:O