With no explanation, label each line with "location-GPE", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
In
total
,
3,452
locals
were
sold
at
the
slave
markets
of
Constantinople
.
In:O
total:O
,:O
3,452:O
locals:O
were:O
sold:O
at:O
the:O
slave:O
markets:O
of:O
Constantinople:location-GPE
.:O