import java.util.Scanner;

public class No113 {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String guide = s.next();
        char[] c = guide.toCharArray();
        int east = 0;
        int north = 0;
        for (int i = 0; i < c.length; i++) {
            if (c[i] == 'N') {
                north++;
            } else if (c[i] == 'E') {
                east++;
            } else if (c[i] == 'S') {
                north--;
            } else if (c[i] == 'W') {
                east--;
            }
        }
        east = Math.abs(east);
        north = Math.abs(north);
        System.out.println(Math.sqrt(east * east + north * north));
    }
}