import java.util.Scanner;

public class No113 {

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

        int x = 0;
        int y = 0;

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

            switch (c) {
            case 'N':
                y++;
                break;
            case 'E':
                x--;
                break;
            case 'W':
                x++;
                break;
            case 'S':
                y--;
                break;
            }
        }

        double result = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));

        System.out.println(result);

        sc.close();
    }

}