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 ":".
Before
becoming
a
full-time
democracy
activist
,
he
worked
as
an
investment
banker
for
over
10
years
.
Before:O
becoming:O
a:O
full-time:O
democracy:O
activist:O
,:O
he:O
worked:O
as:O
an:O
investment:O
banker:O
for:O
over:O
10:O
years:O
.:O