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 ":".
Her
mother
died
at
the
age
of
53
.
Her:O
mother:O
died:O
at:O
the:O
age:O
of:O
53:O
.:O