With no explanation, label each line with "O", "person-athlete", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Unseeded
Juan
Carlos
Ferrero
won
the
singles
title
.
Unseeded:O
Juan:person-athlete
Carlos:person-athlete
Ferrero:person-athlete
won:O
the:O
singles:O
title:O
.:O