package m.shin;
import java.util.Scanner;
public class Con113 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String root = s.next();
		s.close();

		int x = 0 , y = 0;
		for(int i = 0;i < root.length();i++){
			switch(root.charAt(i)){
			case 'N' : y++;
			break;
			case 'S' : y--;
			break;
			case 'E' : x++;
			break;
			case 'W' : x--;
			}
		}
		 double ans = Math.sqrt(x*x + y*y);
		 System.out.println(ans);
	}

}