With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
He
was
the
son
of
a
railway
employee
.
He:O
was:O
the:O
son:O
of:O
a:O
railway:O
employee:O
.:O