With no explanation, label each line with "O", "person-director", "person-actor", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
However
in
a
sudden
turn
of
events
,
Sarathkumar
replaced
Balaji
as
a
director
becoming
actor
's
debut
directorial
.
However:O
in:O
a:O
sudden:O
turn:O
of:O
events:O
,:O
Sarathkumar:person-actor
replaced:O
Balaji:person-director
as:O
a:O
director:O
becoming:O
actor:O
's:O
debut:O
directorial:O
.:O