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
sunscreen
is
at
the
surface
of
the
skin
,
it
filters
the
UV
rays
,
which
attenuates
the
intensity
.
When:O
the:O
sunscreen:O
is:O
at:O
the:O
surface:O
of:O
the:O
skin:O
,:O
it:O
filters:O
the:O
UV:O
rays:O
,:O
which:O
attenuates:O
the:O
intensity:O
.:O