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 ":".
Since
its
foundation
it
has
taken
place
for
four
days
every
year
in
early
spring
.
Since:O
its:O
foundation:O
it:O
has:O
taken:O
place:O
for:O
four:O
days:O
every:O
year:O
in:O
early:O
spring:O
.:O