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 ":".
Two
of
these
messages
were
cracked
in
2006
,
and
the
final
one
was
deciphered
in
2013
.
Two:O
of:O
these:O
messages:O
were:O
cracked:O
in:O
2006:O
,:O
and:O
the:O
final:O
one:O
was:O
deciphered:O
in:O
2013:O
.:O