import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.next();
		scan.close();
		int x = 0;
		int y = 0;
		for(int i = 0; i < S.length(); i++) {
			char c = S.charAt(i);
			if(c == 'N') {
				y ++;
			}else if(c == 'E') {
				x ++;
			}else if(c == 'W') {
				x --;
			}else if(c == 'S') {
				y --;
			}
		}
		double ans = Math.sqrt(x * x + y * y);
		System.out.println(ans);
	}
}