using System;

namespace ConsoleApp31
{
    class Program
    {
        static void Main(string[] args)
        {
            string S = Console.ReadLine();

            int x = 0;
            int y = 0;

            foreach (char c in S)
            {
                switch (c)
                {
                    case 'E':
                        x++;
                        break;

                    case 'W':
                        x--;
                        break;

                    case 'N':
                        y++;
                        break;

                    case 'S':
                        y--;
                        break;
                }
            }

            double l = Math.Sqrt(x * x + y * y);

            Console.WriteLine(l);
        }
    }
}