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 ":".
In
both
Olympic
races
,
he
was
the
stroke
.
In:O
both:O
Olympic:O
races:O
,:O
he:O
was:O
the:O
stroke:O
.:O