With no explanation, label each line with "O", "organization-religion", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Since
the
Bulgarians
were
not
satisfied
with
the
positions
of
the
Pope
after
prolonged
negotiations
,
they
reached
favorable
agreement
with
the
Byzantines
and
the
decision
was
taken
that
the
Bulgarian
Church
should
become
Eastern
Orthodox
.
Since:O
the:O
Bulgarians:O
were:O
not:O
satisfied:O
with:O
the:O
positions:O
of:O
the:O
Pope:O
after:O
prolonged:O
negotiations:O
,:O
they:O
reached:O
favorable:O
agreement:O
with:O
the:O
Byzantines:O
and:O
the:O
decision:O
was:O
taken:O
that:O
the:O
Bulgarian:organization-religion
Church:organization-religion
should:O
become:O
Eastern:organization-religion
Orthodox:organization-religion
.:O