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 ":".
In
1956
,
DP
(
Democratic
Party
)
was
formed
.
In:O
1956:O
,:O
DP:organization-politicalparty
(:O
Democratic:organization-politicalparty
Party:organization-politicalparty
):O
was:O
formed:O
.:O