using System;
using System.Linq;

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

        double H = S.ToCharArray().Count(x => x == 'N') - S.ToCharArray().Count(x => x == 'S');
        double W = S.ToCharArray().Count(x => x == 'E') - S.ToCharArray().Count(x => x == 'W');

        Console.WriteLine(Math.Sqrt(Math.Pow(Math.Abs(H), 2) + Math.Pow(Math.Abs(W), 2)));
    }
}