With no explanation, label each line with "O", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
At
the
2014
Boston
Marathon
she
placed
6th
.
At:O
the:O
2014:O
Boston:event-sportsevent
Marathon:event-sportsevent
she:O
placed:O
6th:O
.:O