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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string S = Console.ReadLine();
            int nn = S.Count(c => c == 'N');
            int ne = S.Count(c => c == 'E');
            int nw = S.Count(c => c == 'W');
            int ns = S.Count(c => c == 'S');
            double fn = Math.Sqrt((nn - ns) * (nn - ns) + (ne - nw) * (ne - nw));
            Console.WriteLine(fn);
            Console.ReadLine();
        }
    }
}