import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int x = 0;
        int y = 0;
        for (char c : s.toCharArray()) {
            if (c == 'N') {
                y++;
            } else if (c == 'W') {
                x--;
            } else if (c == 'S') {
                y--;
            } else {
                x++;
            }
        }
        System.out.println(Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)));
    }
}