import java.util.Scanner;


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

        int x = 0,y = 0;
        double d;

        String s = sc.next();

        for (int i = 0; i < s.length() ; i++ ) {

          char  a = s.charAt(i);

          if (a == 'N') {
            x = x + 1;
          }else if (a == 'S') {
            x = x - 1;
          }else if (a == 'W') {
            y = y + 1;
          }else if (a =='E')
            y = y - 1;
        }
      d = Math.sqrt(x*x + y*y);

        System.out.println(d );
    }
}