With no explanation, label each line with "O", "product-ship", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
``
Prince
of
Wales
``
became
a
barracks
ship
in
1917
.
``:O
Prince:product-ship
of:product-ship
Wales:product-ship
``:O
became:O
a:O
barracks:O
ship:O
in:O
1917:O
.:O