With no explanation, label each line with "O", "organization-company", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Amtrak
asked
railway
equipment
manufacturers
to
submit
proposals
.
Amtrak:organization-company
asked:O
railway:O
equipment:O
manufacturers:O
to:O
submit:O
proposals:O
.:O