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 ":".
Otherwise
,
symptoms
may
last
months
or
even
years
.
Otherwise:O
,:O
symptoms:O
may:O
last:O
months:O
or:O
even:O
years:O
.:O