With no explanation, label each line with "location-GPE", "O", "person-athlete", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Surprisingly
,
in
Athens
he
easily
advanced
into
semi-finals
where
he
defeated
the
two-time
Olympic
champion
Oleg
Saitov
from
Russia
.
Surprisingly:O
,:O
in:O
Athens:O
he:O
easily:O
advanced:O
into:O
semi-finals:O
where:O
he:O
defeated:O
the:O
two-time:O
Olympic:O
champion:O
Oleg:person-athlete
Saitov:person-athlete
from:O
Russia:location-GPE
.:O