With no explanation, label each line with "location-GPE", "O", "product-airplane", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
It
was
not
until
the
day
of
the
German
operation
that
a
Coastal
Command
aircraft
caught
sight
of
the
ships
,
and
by
then
it
was
too
late
.
It:O
was:O
not:O
until:O
the:O
day:O
of:O
the:O
German:location-GPE
operation:O
that:O
a:O
Coastal:product-airplane
Command:product-airplane
aircraft:product-airplane
caught:O
sight:O
of:O
the:O
ships:O
,:O
and:O
by:O
then:O
it:O
was:O
too:O
late:O
.:O