With no explanation, label each line with "O", "person-politician", "location-GPE", "organization-government/governmentagency", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
She
just
turned
twenty
years
old
when
,
in
April
1896
,
during
the
Olympics
games
held
in
Athens
,
King
Alexander
I
of
Serbia
(
last
representative
of
the
Obrenović
dynasty
)
proposed
to
her
.
She:O
just:O
turned:O
twenty:O
years:O
old:O
when:O
,:O
in:O
April:O
1896:O
,:O
during:O
the:O
Olympics:event-sportsevent
games:event-sportsevent
held:O
in:O
Athens:location-GPE
,:O
King:O
Alexander:person-politician
I:person-politician
of:O
Serbia:location-GPE
(:O
last:O
representative:O
of:O
the:O
Obrenović:organization-government/governmentagency
dynasty:organization-government/governmentagency
):O
proposed:O
to:O
her:O
.:O