With no explanation, label each line with "O", "organization-politicalparty", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
After
the
National
Union
ticket
won
the
1864
presidential
election
,
Johnson
was
sworn
in
as
vice
president
on
March
4
,
1865
.
After:O
the:O
National:organization-politicalparty
Union:organization-politicalparty
ticket:O
won:O
the:O
1864:O
presidential:O
election:O
,:O
Johnson:person-politician
was:O
sworn:O
in:O
as:O
vice:O
president:O
on:O
March:O
4:O
,:O
1865:O
.:O