With no explanation, label each line with "O", "person-scholar", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
During
their
appointment
,
they
sat
four
times
with
Albert
Einstein
present
.
During:O
their:O
appointment:O
,:O
they:O
sat:O
four:O
times:O
with:O
Albert:person-scholar
Einstein:person-scholar
present:O
.:O