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
series
of
mishaps
,
however
,
led
to
the
failure
of
the
first
six
flights
.
A:O
series:O
of:O
mishaps:O
,:O
however:O
,:O
led:O
to:O
the:O
failure:O
of:O
the:O
first:O
six:O
flights:O
.:O