using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;

class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string inpt = Reader.ReadLine();

        Dictionary<char, int> dic = new Dictionary<char, int>();
        dic.Add('E', 0);
        dic.Add('S', 0);
        dic.Add('N', 0);
        dic.Add('W', 0);

        foreach (char c in inpt)
        {
            dic[c]++;
        }
        int yoko = Math.Abs(dic['E'] - dic['W']);
        int tate = Math.Abs(dic['N'] - dic['S']);

        double ans = Math.Sqrt(yoko * yoko * 1d + tate * tate);
        Console.WriteLine(ans.ToString("######################################0.###################"));
    }



    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"

SSSSWWW

 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}