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 ":".
He
also
began
Boxing
when
he
was
a
junior
.
He:O
also:O
began:O
Boxing:O
when:O
he:O
was:O
a:O
junior:O
.:O