With no explanation, label each line with "location-GPE", "O", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
In
1955
Austria
became
an
independent
state
and
the
Soviet
Union
withdrew
its
troops
.
In:O
1955:O
Austria:location-GPE
became:O
an:O
independent:O
state:O
and:O
the:O
Soviet:organization-other
Union:organization-other
withdrew:O
its:O
troops:O
.:O