With no explanation, label each line with "O", "person-athlete", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Athletics
has
enjoyed
a
surge
in
popularity
due
to
several
successful
athletes
in
recent
years
,
such
as
Carolina
Klüft
and
Stefan
Holm
.
Athletics:O
has:O
enjoyed:O
a:O
surge:O
in:O
popularity:O
due:O
to:O
several:O
successful:O
athletes:O
in:O
recent:O
years:O
,:O
such:O
as:O
Carolina:person-athlete
Klüft:person-athlete
and:O
Stefan:person-athlete
Holm:person-athlete
.:O