With no explanation, label each line with "O", "organization-politicalparty", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
then
revealed
he
left
PSP
.
He:O
then:O
revealed:O
he:O
left:O
PSP:organization-politicalparty
.:O