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
gathering
was
largely
peaceful
,
but
the
police
employed
water
cannons
for
the
second
time
during
the
months-long
protests
.
The:O
gathering:O
was:O
largely:O
peaceful:O
,:O
but:O
the:O
police:O
employed:O
water:O
cannons:O
for:O
the:O
second:O
time:O
during:O
the:O
months-long:O
protests:O
.:O