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 ":".
In
it
had
a
population
of
.
In:O
it:O
had:O
a:O
population:O
of:O
.:O