With no explanation, label each line with "O", "person-athlete", "organization-sportsteam", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Along
with
defensemen
Viacheslav
Fetisov
and
Alexei
Kasatonov
,
they
formed
the
``
Green
Unit
``
,
so
named
because
they
wore
green
jerseys
in
practice
.
Along:O
with:O
defensemen:O
Viacheslav:person-athlete
Fetisov:person-athlete
and:O
Alexei:person-athlete
Kasatonov:person-athlete
,:O
they:O
formed:O
the:O
``:O
Green:organization-sportsteam
Unit:organization-sportsteam
``:O
,:O
so:O
named:O
because:O
they:O
wore:O
green:O
jerseys:O
in:O
practice:O
.:O