module String = struct
  include String

  let to_list str =
    let rec doit i acc =
      if i < 0 then acc
      else doit (i - 1) (String.get str i :: acc) in
    doit (String.length str - 1) []

  let fold_left f init str =
    let n = String.length str - 1 in
    let rec doit i acc =
      if i > n then acc
      else doit (i + 1) (f acc str.[i]) in
    doit 0 init

end

let () =
  let x, y = read_line () |> String.fold_left (fun (x, y) c ->
    if c = 'N' then x, y - 1
    else if c = 'E' then x - 1, y
    else if c = 'W' then x + 1, y
    else x, y + 1) (0, 0) in
  let x, y = float x, float y in
  Printf.printf "%f\n" (x *. x +. y *. y |> sqrt)