using System;
using System.Linq;

class Program
{
    const char North = 'N';
    const char East = 'E';
    const char West = 'W';
    const char South = 'S';
    static void Main(string[] args)
    {
        var line = Console.ReadLine().ToCharArray().OrderBy(x => x).ToList();
        int nCnt = line.Count(x => x == North);
        int eCnt = line.Count(x => x == East);
        int wCnt = line.Count(x => x == West);
        int sCnt = line.Count(x => x == South);

        int horizontal = Math.Abs(nCnt - sCnt);
        int vartical = Math.Abs(eCnt - wCnt);

        var dist = Math.Sqrt(
                        Math.Pow(horizontal, 2) +
                        Math.Pow(vartical, 2) 
                   );
        Console.WriteLine(Math.Round(dist,5, MidpointRounding.AwayFromZero));
        return;
    }
}