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 ":".
Their
hind
legs
are
slightly
longer
than
their
forelegs
;
they
have
three
toes
on
their
rear
feet
and
four
toes
on
their
front
feet
.
Their:O
hind:O
legs:O
are:O
slightly:O
longer:O
than:O
their:O
forelegs:O
;:O
they:O
have:O
three:O
toes:O
on:O
their:O
rear:O
feet:O
and:O
four:O
toes:O
on:O
their:O
front:O
feet:O
.:O