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 ":".
On
23
October
1943
was
sighted
by
a
B-24
Liberator
of
No
.
On:O
23:O
October:O
1943:O
was:O
sighted:O
by:O
a:O
B-24:O
Liberator:O
of:O
No:O
.:O