With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
this
,
Loughner
briefly
volunteered
at
a
local
animal
shelter
,
walking
dogs
,
but
he
was
eventually
asked
not
to
return
.
After:O
this:O
,:O
Loughner:person-other
briefly:O
volunteered:O
at:O
a:O
local:O
animal:O
shelter:O
,:O
walking:O
dogs:O
,:O
but:O
he:O
was:O
eventually:O
asked:O
not:O
to:O
return:O
.:O