With no explanation, label each line with "location-GPE", "O", "building-hospital", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Cho
Pyong-ok
went
to
the
United
States
for
a
stomach
operation
at
the
Walter
Reed
Army
Medical
Center
but
died
there
of
a
heart
attack
.
Cho:person-politician
Pyong-ok:person-politician
went:O
to:O
the:O
United:location-GPE
States:location-GPE
for:O
a:O
stomach:O
operation:O
at:O
the:O
Walter:building-hospital
Reed:building-hospital
Army:building-hospital
Medical:building-hospital
Center:building-hospital
but:O
died:O
there:O
of:O
a:O
heart:O
attack:O
.:O