With no explanation, label each line with "location-GPE", "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
At
the
time
when
everyone
was
fleeing
from
Valjevo
,
Babić
returned
to
her
hometown
to
help
the
sick
.
At:O
the:O
time:O
when:O
everyone:O
was:O
fleeing:O
from:O
Valjevo:location-GPE
,:O
Babić:person-other
returned:O
to:O
her:O
hometown:O
to:O
help:O
the:O
sick:O
.:O