With no explanation, label each line with "O", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
that
he
joined
South
China
AA
and
became
their
main
defender
.
After:O
that:O
he:O
joined:O
South:organization-sportsteam
China:organization-sportsteam
AA:organization-sportsteam
and:O
became:O
their:O
main:O
defender:O
.:O