import java.util.Scanner;
public class Yukicoder113 {
	public static void main(String[] args) {
		String s = new Scanner(System.in).next();
		double ew = 0, ns = 0;
		for (int i = 0; i < s.length(); i++) {
			switch(s.charAt(i)) {
				case 'N':
					ns++;
					break;
				case 'E':
					ew++;
					break;
				case 'W':
					ew--;
					break;
				case 'S':
					ns--;
					break;
			}
		}
		System.out.println(Math.hypot(ns, ew));
	}
}