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 ":".
A
properly
fitting
and
flexing
boot
is
crucial
to
preventing
this
condition
.
A:O
properly:O
fitting:O
and:O
flexing:O
boot:O
is:O
crucial:O
to:O
preventing:O
this:O
condition:O
.:O