With no explanation, label each line with "O", "product-train", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
At
the
time
it
was
built
,
``
El
Gobernador
``
was
the
largest
railroad
locomotive
in
the
world
.
At:O
the:O
time:O
it:O
was:O
built:O
,:O
``:O
El:product-train
Gobernador:product-train
``:O
was:O
the:O
largest:O
railroad:O
locomotive:O
in:O
the:O
world:O
.:O