With no explanation, label each line with "O", "organization-education", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
The
president
arrived
by
helicopter
which
landed
on
the
grounds
of
the
Shadow
Hills
Elementary
School
.
The:O
president:O
arrived:O
by:O
helicopter:O
which:O
landed:O
on:O
the:O
grounds:O
of:O
the:O
Shadow:organization-education
Hills:organization-education
Elementary:organization-education
School:organization-education
.:O