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 ":".
Flat
surfaces
often
have
artwork
such
as
landscapes
painted
directly
on
them
.
Flat:O
surfaces:O
often:O
have:O
artwork:O
such:O
as:O
landscapes:O
painted:O
directly:O
on:O
them:O
.:O