With no explanation, label each line with "product-airplane", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
After
this
tour
his
prowess
as
a
pilot
led
to
his
selection
as
a
Blue
Angel
.
After:O
this:O
tour:O
his:O
prowess:O
as:O
a:O
pilot:O
led:O
to:O
his:O
selection:O
as:O
a:O
Blue:product-airplane
Angel:product-airplane
.:O