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 ":".
When
the
commissioner
took
up
office
the
existing
Police
Authority
was
abolished
.
When:O
the:O
commissioner:O
took:O
up:O
office:O
the:O
existing:O
Police:O
Authority:O
was:O
abolished:O
.:O