using System;
public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;


        //E6 S7 W4 N3 = s4 e2
        int e = 0;
        int s = 0;
        int w = 0;
        int n = 0;
        for (int i = 0; i < str.Length; i++)
        {
            if (str[i] == 'E')
            {
                e++;
            }
            else if (str[i] == 'S')
            {
                s++;
            }
            else if (str[i] == 'W')
            {
                w++;
            }
            else
            {
                n++;
            }
        }
        int a = ((n - s) * (n - s)) + ((e - w) * (e - w));

        double d = Math.Sqrt(a);
        Console.WriteLine(d);

    }
}