import java.util.*;
import java.math.*;
import java.io.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] in = sc.next().toCharArray();
		int x = 0;
		int y = 0;
		for(int i = 0; i < in.length; i++) {
			if(in[i] == 'N') y++;
			if(in[i] == 'S') y--;
			if(in[i] == 'W') x--;
			if(in[i] == 'E') x++;
		}
		double ans = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
		System.out.printf("%.20f\n",ans);
	}
}