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 ":".
When
he
took
office
in
1985
,
he
faced
a
staggering
economic
crisis
.
When:O
he:O
took:O
office:O
in:O
1985:O
,:O
he:O
faced:O
a:O
staggering:O
economic:O
crisis:O
.:O