With no explanation, label each line with "O", "person-politician", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Alexander
Kerensky
was
a
key
player
in
the
new
regime
.
Alexander:person-politician
Kerensky:person-politician
was:O
a:O
key:O
player:O
in:O
the:O
new:O
regime:O
.:O