using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        // No.113 宝探し

        char[] S = Console.ReadLine().ToCharArray();

        int N = 0, E = 0;

        for (int i = 0; i < S.Length; i++)
        {
            if ('N'.Equals(S[i])) N++;
            if ('E'.Equals(S[i])) E++;
            if ('W'.Equals(S[i])) E--;
            if ('S'.Equals(S[i])) N--;
        }

        Console.WriteLine(Math.Round(Math.Sqrt(N * N + E * E),5));
    }
}