With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
Ivan
Vladislav
took
the
crown
in
August
1015
,
he
pretended
to
agree
to
surrender
to
the
Byzantines
.
After:O
Ivan:person-politician
Vladislav:person-politician
took:O
the:O
crown:O
in:O
August:O
1015:O
,:O
he:O
pretended:O
to:O
agree:O
to:O
surrender:O
to:O
the:O
Byzantines:O
.:O