import java.util.*;
class y113 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		double x = 0, y = 0;
		for (int i=0; i<s.length(); i++) {
			if	(s.charAt(i) == 'N')	y--;
			else if	(s.charAt(i) == 'E')	x++;
			else if	(s.charAt(i) == 'W')	x--;
			else if	(s.charAt(i) == 'S')	y++;
		}
		System.out.println(Math.hypot(x, y));
		sc.close();
	}
}