type dir = North | East | West | South

let dir_of_char = function
  | 'N' -> North | 'E' -> East | 'W' -> West | 'S' -> South | _ -> failwith ""

let solve s =
  let slen = String.length s in
  let rec solve' idx pos =
    if idx >= slen then pos
    else
      let d = dir_of_char s.[idx]
      and x, y = pos in
      let nextPos = match d with
        | North -> (x, y - 1)
        | East ->  (x + 1, y)
        | West ->  (x - 1, y)
        | South -> (x, y + 1)
      in
      solve' (idx + 1) nextPos
  in
  let x, y = solve' 0 (0, 0) in
  x * x + y * y |> float_of_int |> sqrt

let () =
  let s = read_line () in
  solve s |> Printf.printf "%.3f"