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
conference
issued
a
declaration
on
15
November
and
concluded
on
November
24
,
having
taken
no
effective
measures
.
The:O
conference:O
issued:O
a:O
declaration:O
on:O
15:O
November:O
and:O
concluded:O
on:O
November:O
24:O
,:O
having:O
taken:O
no:O
effective:O
measures:O
.:O