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 ":".
Of
the
cathedral
only
the
northern
porch
survived
;
the
main
building
was
torn
down
in
the
early
19th
century
.
Of:O
the:O
cathedral:O
only:O
the:O
northern:O
porch:O
survived:O
;:O
the:O
main:O
building:O
was:O
torn:O
down:O
in:O
the:O
early:O
19th:O
century:O
.:O