var a:array[1..100]of integer;
 f,g:text
  n,i,nr1,nr,dif,j:integer;
begin
assign(f,'multimi2.in');
assign(g,'multimi2.out');
reset(f);
rewrite(g);
 readln(f,n);
  for i:=1 to n do
     readln(f,a[i]);
  i:=n;
  while i-4>=0 do begin
          a[i]:=1;
          a[i]:=2;
          a[i]:=3;
          i:=i-4;
        end;
   nr1:n div 4 * 2;
   case i of
   0:dif:=0;
   1:begin
      a[1]:=1;
      dif:=1;
      inc(nr1);
    end;
   2:begin
      a[1]:=1
      a[2]:=2
      dif:=1;
      inc(nr1);
    end;
   3:begin
      a[1]:=1;
      a[2]:=2;
      a[3]:=2;
      dif:=0;
   end;     end;
 Writeln(g,dif);
 writeln(g,nr1);
 for i:=1 to n do
    if a[i]=1 then write(g,i,' ');
 writeln(g);
 writeln(g,n-nr1);
 for i:=1 to n do
    if a[i]=2 then write(g,i,' ');
    close(f);
    close(g);
    end.