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 ":".
In
April
each
year
,
there
is
a
larger
gathering
to
celebrate
his
anniversary
.
In:O
April:O
each:O
year:O
,:O
there:O
is:O
a:O
larger:O
gathering:O
to:O
celebrate:O
his:O
anniversary:O
.:O