import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.nextLine();
        String [] arr = S.split("");
        int mx = 0;
        int my = 0;
        for(int i=0; i<arr.length; i++){
            if( arr[i].equals("N") ){
                my = my + 1;
            }else if( arr[i].equals("S") ){
                my = my - 1;
            }else if( arr[i].equals("E") ){
                mx = mx + 1;
            }else if( arr[i].equals("W") ){
                mx = mx - 1;
            }
        }
        double dis = Math.sqrt(mx*mx+my*my);
        System.out.println(dis);
    }
}