using System;

class Program
{
    static void Main()
    {
        string s = Console.ReadLine();

        int x = 0;
        int y = 0;

        for (int i = 0; i < s.Length; i++)
        {
            switch (s[i])
            {
                case 'N': y++; break;
                case 'E': x++; break;
                case 'W': x--; break;
                case 'S': y--; break;
            }
        }

        Console.WriteLine(Math.Sqrt(x * x + y * y));
    }
}