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
expedition
climbed
the
western
part
of
the
South
face
and
continued
over
the
southwest
ridge
to
the
highest
summit
.
The:O
expedition:O
climbed:O
the:O
western:O
part:O
of:O
the:O
South:O
face:O
and:O
continued:O
over:O
the:O
southwest:O
ridge:O
to:O
the:O
highest:O
summit:O
.:O