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 ":".
Shortly
thereafter
,
he
went
back
to
school
to
become
certified
as
a
children
's
guidance
counselor
.
Shortly:O
thereafter:O
,:O
he:O
went:O
back:O
to:O
school:O
to:O
become:O
certified:O
as:O
a:O
children:O
's:O
guidance:O
counselor:O
.:O