With no explanation, label each line with "location-GPE", "O", "location-mountain", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
By
the
end
of
the
month
,
the
Peruvian
stronghold
of
Los
Angeles
Hill
,
-a
position
considered
unbreakable
by
the
Allies-
fell
to
Baquedano
.
By:O
the:O
end:O
of:O
the:O
month:O
,:O
the:O
Peruvian:location-GPE
stronghold:O
of:O
Los:location-mountain
Angeles:location-mountain
Hill:location-mountain
,:O
-a:O
position:O
considered:O
unbreakable:O
by:O
the:O
Allies-:O
fell:O
to:O
Baquedano:organization-other
.:O