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
two
sides
are
connected
by
a
footbridge
.
The:O
two:O
sides:O
are:O
connected:O
by:O
a:O
footbridge:O
.:O