import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next();
		double x = 0, y = 0;
		char c;
		for (int i = 0; i < s.length(); i++) {
			c = s.charAt(i);
			if (c == 'W') {
				x++;
			} else if (c == 'E') {
				x--;
			} else if (c == 'N') {
				y++;
			} else {
				y--;
			}
		}
		System.out.println(Math.sqrt(x * x + y * y));
	}
}