With no explanation, label each line with "location-GPE", "O", "building-hospital", "other-medical", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
After
residency
in
Pediatrics
at
Hokkaido
University
Hospital
,
he
worked
as
a
pediatrician
in
Japan
for
several
years
.
After:O
residency:O
in:O
Pediatrics:other-medical
at:O
Hokkaido:building-hospital
University:building-hospital
Hospital:building-hospital
,:O
he:O
worked:O
as:O
a:O
pediatrician:other-medical
in:O
Japan:location-GPE
for:O
several:O
years:O
.:O