using System;

public class Program
{
	public static int CountChar(string str, char ch)
	{
		return str.Length - str.Replace(ch.ToString(), "").Length;
	}
	
	public static void Main()
	{
		string move = Console.ReadLine();
		int n = CountChar(move, 'N');
		int s = CountChar(move, 'S');
		int e = CountChar(move, 'E');
		int w = CountChar(move, 'W');
		Console.WriteLine(Math.Sqrt((n - s) * (n - s) + (e - w) * (e - w)));
	}
}