import java.util.Scanner;


public class Main_yukicoder113 {

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

        char[] s = sc.next().toCharArray();
        int x = 0;
        int y = 0;
        for (char e : s) {
        	switch (e) {
        	case 'N':
        		y++;
        		break;
        	case 'E':
        		x++;
        		break;
        	case 'W':
        		x--;
        		break;
        	case 'S':
        		y--;
        		break;
        	}
        }

        System.out.printf("%.3f\n", Math.sqrt(x * x + y * y));
        
        sc.close();
    }
}