let () =
  let n, k = Scanf.scanf "%d %d " (fun n k -> n, k) in
  let s = Scanf.scanf "%s " (fun i -> i) in
  let rec doit i acc pairs =
    if i = n then pairs
    else if s.[i] = '(' then doit (i + 1) (i :: acc) pairs
    else
      match acc with
      | [] -> assert false
      | j :: tl -> doit (i + 1) tl ((j + 1, i + 1) :: pairs) in
  let rec aux = function
    | [] -> assert false
    | (j, i) :: tl ->
      if j = k then Printf.printf "%d\n" i
      else if i = k then Printf.printf "%d\n" j
      else aux tl in
  doit 0 [] [] |> aux