With no explanation, label each line with "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
flew
in
the
Royal
Flying
Corps
and
Royal
Air
Force
as
a
pilot
between
1917
and
1919
.
He:O
flew:O
in:O
the:O
Royal:organization-other
Flying:organization-other
Corps:organization-other
and:O
Royal:organization-other
Air:organization-other
Force:organization-other
as:O
a:O
pilot:O
between:O
1917:O
and:O
1919:O
.:O