With no explanation, label each line with "location-GPE", "O", "building-airport", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-hospital" preceded by ":".
The
Zurich
Airport
Skymetro
is
an
underground
airport
people
mover
at
Zurich
Airport
in
Switzerland
.
The:O
Zurich:building-airport
Airport:building-airport
Skymetro:O
is:O
an:O
underground:O
airport:O
people:O
mover:O
at:O
Zurich:building-airport
Airport:building-airport
in:O
Switzerland:location-GPE
.:O