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 ":".
Skaters
competed
in
the
disciplines
of
men
's
singles
,
ladies
'
singles
,
and
ice
dancing
.
Skaters:O
competed:O
in:O
the:O
disciplines:O
of:O
men:O
's:O
singles:O
,:O
ladies:O
':O
singles:O
,:O
and:O
ice:O
dancing:O
.:O