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 ":".
By
the
late
19th
century
,
there
was
little
left
but
the
stone
retaining
walls
and
Old
Betsy
.
By:O
the:O
late:O
19th:O
century:O
,:O
there:O
was:O
little:O
left:O
but:O
the:O
stone:O
retaining:O
walls:O
and:O
Old:O
Betsy:O
.:O