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 ":".
The
castle
is
a
scheduled
monument
.
The:O
castle:O
is:O
a:O
scheduled:O
monument:O
.:O