program main
  character(len=600)::str
  character(3),parameter::silence=CHAR(226)//CHAR(128)//CHAR(166)
  integer,parameter::undef=-2
  integer::prev=undef,len=0,maxlen=0,diff
  read *,str
  do i=1,LEN_TRIM(str)
     if ((i-prev).eq.2) cycle
     if ( str(i:i+2) .eq. silence ) then
        diff = i-prev
        prev   = i
        if( diff.eq.3 ) then
           len    = len + 1
           maxlen = MAX(len, maxlen)
        else if(diff.gt.3) then
           len    = 1
        end if
     end if
  end do
  print '(i0)', maxlen
end program main