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
protesters
insisted
that
their
demand
to
reform
the
monarchy
is
already
the
best
compromise
they
could
offer
.
The:O
protesters:O
insisted:O
that:O
their:O
demand:O
to:O
reform:O
the:O
monarchy:O
is:O
already:O
the:O
best:O
compromise:O
they:O
could:O
offer:O
.:O