fun readStr () =
    valOf (TextIO.inputLine TextIO.stdIn)

exception WrongInput
fun findAns s =
    let
        val (x, y) =
            List.foldl
                (fn (ch, (x_acc, y_acc)) =>
                    case ch of
                        #"N" => (x_acc, y_acc - 1)
                      | #"E" => (x_acc + 1, y_acc)
                      | #"W" => (x_acc - 1, y_acc)
                      | #"S" => (x_acc, y_acc + 1)
                      | _ => raise WrongInput
                )
                (0, 0)
                (String.explode s)
    in
        Math.sqrt (Real.fromInt (x*x + y*y))
    end

val () =
    let
        val s = readStr ()
        val sWithoutCR = String.substring(s, 0, String.size s - 1)
        val ans = findAns sWithoutCR
    in
        print (Real.toString ans ^ "\n")  
    end