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 ":".
He
was
liberated
in
May
1945
.
He:O
was:O
liberated:O
in:O
May:O
1945:O
.:O