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
has
supervised
more
than
200
graduate
students
and
postdoctoral
researchers
over
his
career
since
1955
.
He:O
has:O
supervised:O
more:O
than:O
200:O
graduate:O
students:O
and:O
postdoctoral:O
researchers:O
over:O
his:O
career:O
since:O
1955:O
.:O