With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Many
international
observers
stress
that
Hong
Kong
's
economy
has
been
declining
due
to
the
long-lasting
civil
unrest
.
Many:O
international:O
observers:O
stress:O
that:O
Hong:location-GPE
Kong:location-GPE
's:O
economy:O
has:O
been:O
declining:O
due:O
to:O
the:O
long-lasting:O
civil:O
unrest:O
.:O