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
district
is
the
most
visited
and
toured
location
in
the
city
.
The:O
district:O
is:O
the:O
most:O
visited:O
and:O
toured:O
location:O
in:O
the:O
city:O
.:O