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 ":".
On
17
November
,
he
signed
a
two-and-a-half-year
contract
.
On:O
17:O
November:O
,:O
he:O
signed:O
a:O
two-and-a-half-year:O
contract:O
.:O