With no explanation, label each line with "O", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Between
1997
and
2004
for
Bulgaria
national
football
team
he
had
37
caps
and
scored
1
goals
.
Between:O
1997:O
and:O
2004:O
for:O
Bulgaria:organization-sportsteam
national:organization-sportsteam
football:organization-sportsteam
team:organization-sportsteam
he:O
had:O
37:O
caps:O
and:O
scored:O
1:O
goals:O
.:O