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 ":".
Union
cavalry
outposts
north
of
the
town
detected
both
movements
.
Union:O
cavalry:O
outposts:O
north:O
of:O
the:O
town:O
detected:O
both:O
movements:O
.:O