With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
It
underwent
a
highly
controversial
monetary
reform
in
1953
.
It:O
underwent:O
a:O
highly:O
controversial:O
monetary:O
reform:O
in:O
1953:O
.:O