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 ":".
A
number
of
caves
were
mined
,
and
the
men
and
boys
who
worked
in
the
caves
were
called
``
peter
monkey
''
,
somewhat
in
imitation
of
the
naval
term
``
powder
monkey
''
that
was
used
for
the
boys
who
brought
up
charges
of
gunpowder
on
gunboats
.
A:O
number:O
of:O
caves:O
were:O
mined:O
,:O
and:O
the:O
men:O
and:O
boys:O
who:O
worked:O
in:O
the:O
caves:O
were:O
called:O
``:O
peter:O
monkey:O
'':O
,:O
somewhat:O
in:O
imitation:O
of:O
the:O
naval:O
term:O
``:O
powder:O
monkey:O
'':O
that:O
was:O
used:O
for:O
the:O
boys:O
who:O
brought:O
up:O
charges:O
of:O
gunpowder:O
on:O
gunboats:O
.:O