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
retrospective
was
held
by
the
in
1888
.
A:O
retrospective:O
was:O
held:O
by:O
the:O
in:O
1888:O
.:O