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
record
retreat
of
happened
in
2006
alone
.
A:O
record:O
retreat:O
of:O
happened:O
in:O
2006:O
alone:O
.:O