using System;

public class Program {
	public static void Main(string[] args) {
		char[] c = Console.ReadLine().ToCharArray();
		int x = 0;
		int y = 0;
		for (int i = 0; i < c.Length; i++) {
			switch(c[i]) {
				case 'N': y++; break;
				case 'W': x++; break;
				case 'E': x--; break;
				case 'S': y--; break;
			}
		}
		Console.WriteLine(Math.Sqrt(x*x + y*y));
	}
}