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 ":".
Queen
Mary
sent
her
a
letter
and
signed
portrait
of
herself
.
Queen:O
Mary:O
sent:O
her:O
a:O
letter:O
and:O
signed:O
portrait:O
of:O
herself:O
.:O