import java.util.*;
public class Treasure{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int x=0,y=0;
		double res;
		String in;
		in = sc.next();
		int l = in.length();
		for(int i = 0;i<l;i++){
			if(in.charAt(i) == 'N'){
				y++;
			}else if(in.charAt(i) == 'E'){
				x++;
			}else if(in.charAt(i) == 'S'){
				y--;
			}else{
				x--;
			}
		}
		res = Math.sqrt(x*x+y*y);
		System.out.println(res);
	}
}