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 ":".
At
the
2011
World
Championships
in
February
,
he
won
the
silver
medal
in
the
downhill
.
At:O
the:O
2011:O
World:event-sportsevent
Championships:event-sportsevent
in:O
February:O
,:O
he:O
won:O
the:O
silver:O
medal:O
in:O
the:O
downhill:O
.:O