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

class Program
{
    static string InputPattern = "Input1";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("NE");
            //1.41421
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("EN");
            //1.41421
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("SSSSWWW");
            //5
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string S = InputList[0];

        double HeniX = 0, HeniY = 0;
        HeniX += S.Count(A => A == 'E');
        HeniX -= S.Count(A => A == 'W');
        HeniY += S.Count(A => A == 'S');
        HeniY -= S.Count(A => A == 'N');

        Console.WriteLine(Math.Sqrt(HeniX * HeniX + HeniY * HeniY));
    }
}