using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {

            string s = Console.ReadLine();
            int[] b = new int[4];
            double c=0;
            double d = 0;
 
            double ans = 0;
            for(int i = 0; i <s.Length; i++)
            {
               string  a = s.Substring(i,1);
                if (a == "N")
                {
                    b[0]++;
                }else if (a == "E")
                {
                    b[1]++;
                }else if (a == "W")
                {
                    b[2]++;
                }else
                {
                    b[3]++;
                }
            }
            c = b[0] - b[3];
            d = b[2] - b[1];
            if (c < 0)
            {
                c *= -1;
            }
            if (d < 0)
            {
                d *= -1;
            }
            c=Math.Pow(c, 2);
            d = Math.Pow(d, 2);
            ans = Math.Sqrt(c + d) ;
            
            Console.WriteLine(ans);
            
        }
    }
}