{. fn sum(x) :=
  {. (+)|0 x;

{. fn count(x) :=
  {. sum [:1"x;

fn count(x) ≔
  (+)|0 [:1"x;

fn processLine(b) ≔
  let
    val pre := (split b /-/).1
    val l := #pre
    val res := substr pre (l-1) l
  in res end;

let
  val iStream := processLine"$0
  val white := count ((='1') #. iStream)
  val black := count ((='0') #. iStream)
  val draw := count ((='2') #. iStream)
  val total := white + black + draw
in (total . white . black . draw) end