With no explanation, label each line with "O", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
won
21
medals
for
the
USSR
.
He:O
won:O
21:O
medals:O
for:O
the:organization-sportsteam
USSR:organization-sportsteam
.:O