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

class Magatro
{
    static void Main()
    {
        string s = Console.ReadLine();
        int n=0, e=0;
        for(int i = 0; i < s.Length; i++)
        {
            switch (s[i])
            {
                case 'N':
                    n++;
                    break;
                case 'E':
                    e++;
                    break;
                        case 'S':
                    n--;
                    break;
                case 'W':
                    e--;
                    break;
            }
        }
        Console.WriteLine(Math.Sqrt(n * n + e * e));
    }
}