With no explanation, label each line with "location-GPE", "person-soldier", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
The
cause
of
the
conflict
was
that
Uzun
Hasan
maintained
ties
with
the
Byzantines
,
who
moved
to
the
east
after
the
conquest
of
their
capital
Constantinople
by
Sultan
Mehmed
II
in
1453
.
The:O
cause:O
of:O
the:O
conflict:O
was:O
that:O
Uzun:person-soldier
Hasan:person-soldier
maintained:O
ties:O
with:O
the:O
Byzantines:O
,:O
who:O
moved:O
to:O
the:O
east:O
after:O
the:O
conquest:O
of:O
their:O
capital:O
Constantinople:location-GPE
by:O
Sultan:location-GPE
Mehmed:person-politician
II:person-politician
in:O
1453:O
.:O