With no explanation, label each line with "O", "person-actor", "organization-education", "person-director", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other" or "art-painting" preceded by ":".
Lester
served
as
the
head
football
coach
at
Richard
Montgomery
High
School
in
Rockville
,
Maryland
,
from
1959
to
1968
.
Lester:person-other
served:O
as:O
the:O
head:O
football:O
coach:O
at:O
Richard:organization-education
Montgomery:organization-education
High:organization-education
School:organization-education
in:O
Rockville:person-director
,:O
Maryland:person-actor
,:O
from:O
1959:O
to:O
1968:O
.:O