With no explanation, label each line with "location-GPE", "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Emperor
Xuanzong
fled
to
Sichuan
during
the
war
and
abdicated
the
throne
to
Li
Yu
(
whose
name
had
been
changed
to
Li
Heng
at
that
point
)
(
as
Emperor
Suzong
)
.
Emperor:person-politician
Xuanzong:person-politician
fled:O
to:O
Sichuan:location-GPE
during:O
the:O
war:O
and:O
abdicated:O
the:O
throne:O
to:O
Li:person-politician
Yu:person-politician
(:O
whose:O
name:O
had:O
been:O
changed:O
to:O
Li:person-politician
Heng:person-politician
at:O
that:O
point:O
):O
(:O
as:O
Emperor:person-politician
Suzong:person-politician
):O
.:O