import java.util.*;

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