With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Its
alliance
with
the
United
States
was
especially
close
after
the
Soviets
invaded
the
neighbouring
country
of
Afghanistan
.
Its:O
alliance:O
with:O
the:O
United:location-GPE
States:location-GPE
was:O
especially:O
close:O
after:O
the:O
Soviets:location-GPE
invaded:O
the:O
neighbouring:O
country:O
of:O
Afghanistan:location-GPE
.:O