With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Canada
Post
issued
two
stamps
to
commemorate
the
event
.
Canada:organization-company
Post:organization-company
issued:O
two:O
stamps:O
to:O
commemorate:O
the:O
event:O
.:O