With no explanation, label each line with "O", "other-currency", "organization-company", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
As
of
2007
,
the
total
cost
of
Porto
Metro
mass
transit
public
transport
system
stands
on
3,500
million
euros
-
over
1
%
of
Portugal
's
GDP
.
As:O
of:O
2007:O
,:O
the:O
total:O
cost:O
of:O
Porto:organization-company
Metro:organization-company
mass:O
transit:O
public:O
transport:O
system:O
stands:O
on:O
3,500:O
million:O
euros:other-currency
-:O
over:O
1:O
%:O
of:O
Portugal:organization-government/governmentagency
's:O
GDP:O
.:O