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 ":".
When
the
bridge
opened
,
it
was
the
longest
continuous
plate
girder
bridge
in
the
country
.
When:O
the:O
bridge:O
opened:O
,:O
it:O
was:O
the:O
longest:O
continuous:O
plate:O
girder:O
bridge:O
in:O
the:O
country:O
.:O