import java.util.*;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        String a = koko.next();
        char[] ah = a.toCharArray();
        double n=0;
        double e=0;
        double w=0;
        double s=0;
        for(int i=0; i<a.length(); i++){
            if(ah[i]=='N'){
                n++;
            }else if(ah[i]=='E'){
                e++;
            }else if(ah[i]=='W'){
                w++;
            }else{
                s++;
            }
        }
        double d=Math.sqrt((n-s)*(n-s)+(e-w)*(e-w));
        System.out.println(d);
    }
}