With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
The
sea
near
the
station
is
covered
in
pack
ice
for
much
of
the
year
,
out
to
a
distance
of
as
much
as
100
km
at
the
end
of
winter
.
The:O
sea:O
near:O
the:O
station:O
is:O
covered:O
in:O
pack:O
ice:O
for:O
much:O
of:O
the:O
year:O
,:O
out:O
to:O
a:O
distance:O
of:O
as:O
much:O
as:O
100:O
km:O
at:O
the:O
end:O
of:O
winter:O
.:O