let f (x,y) = function
    | 'N' -> x,y+1.
    | 'E' -> x+1.,y
    | 'W' -> x-1.,y
    | 'S' -> x,y-1.
    | _ -> failwith "error!"
let x,y =
    stdin.ReadLine()
    |> Seq.fold f (0.,0.)
let s = sqrt((x*x)+(y*y))
printfn "%2.5f" s