using System;
using System.Text;
using System.Linq;

namespace ConsoleApp11
{
    class Program
    {
        static void Main(string[] args)
        {
            string S = Console.ReadLine();

            double countN = 0;
            double countE = 0;
            double countW = 0;
            double countS = 0;
            double sum = 0;

            for(int i = 0; i < S.Length; i++)
            {
                if(S[i] == 'N')
                {
                    countN++;
                }
                else if(S[i] == 'E')
                {
                    countE++;
                }
                else if(S[i] == 'W')
                {
                    countW++;
                }
                else if(S[i] == 'S')
                {
                    countS++;
                }
            }

            sum = (countN * countN) + (countE * countE) + (countW * countW) + (countS * countS);

            double root = Math.Sqrt(sum);

            Console.WriteLine(root);
        }        
    }
}