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 ":".
However
,
so
many
firemen
and
emergency
servicemen
have
been
killed
while
trying
to
control
large
fires
that
the
cautious
philosophy
is
to
evacuate
and
take
shelter
until
the
material
burns
itself
out
.
However:O
,:O
so:O
many:O
firemen:O
and:O
emergency:O
servicemen:O
have:O
been:O
killed:O
while:O
trying:O
to:O
control:O
large:O
fires:O
that:O
the:O
cautious:O
philosophy:O
is:O
to:O
evacuate:O
and:O
take:O
shelter:O
until:O
the:O
material:O
burns:O
itself:O
out:O
.:O