With no explanation, label each line with "O", "organization-sportsteam", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Prior
to
the
start
of
the
season
,
29
May
2018
,
Sergey
Semak
replaced
Roberto
Mancini
as
manager
of
Zenit
.
Prior:O
to:O
the:O
start:O
of:O
the:O
season:O
,:O
29:O
May:O
2018:O
,:O
Sergey:person-other
Semak:person-other
replaced:O
Roberto:person-other
Mancini:person-other
as:O
manager:O
of:O
Zenit:organization-sportsteam
.:O