program main
  character(len=600)::str
  integer::prev=-1,len=0,maxlen=0
  read *,str

  do i=1,LEN_TRIM(str)
     if ( ICHAR(str(i  :i  )).eq.226 .and. &
          ICHAR(str(i+1:i+1)).eq.128 .and. &
          ICHAR(str(i+2:i+2)).eq.166 ) then

        if( (i-prev.eq.3) .or. (prev.eq.-1)) then
           prev   = i
           len    = len + 1
           maxlen = MAX(len, maxlen)
        else
           prev   = -1
           len    = 0
        end if
     else if(i-prev.eq.3) then
        prev = -1
        len = 0
     end if
  end do
  print '(i0)', maxlen
end program main