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 ":".
However
,
The
building
was
now
over
50
years
old
and
was
beginning
to
show
its
age
.
However:O
,:O
The:O
building:O
was:O
now:O
over:O
50:O
years:O
old:O
and:O
was:O
beginning:O
to:O
show:O
its:O
age:O
.:O