With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
attendance
of
the
Emperor
and
Empress
at
the
ceremony
was
regarded
as
a
rare
honour
.
The:O
attendance:O
of:O
the:O
Emperor:O
and:O
Empress:O
at:O
the:O
ceremony:O
was:O
regarded:O
as:O
a:O
rare:O
honour:O
.:O