With no explanation, label each line with "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Wang
has
also
won
18
gold
medals
at
the
World
Championships
.
Wang:O
has:O
also:O
won:O
18:O
gold:O
medals:O
at:O
the:O
World:event-sportsevent
Championships:event-sportsevent
.:O