With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
was
discovered
by
astronomer
Heinrich
d'Arrest
on
February
14
,
1863
.
It:O
was:O
discovered:O
by:O
astronomer:O
Heinrich:person-other
d'Arrest:person-other
on:O
February:O
14:O
,:O
1863:O
.:O