package no113;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = 0, y = 0;
		char[] s = sc.next().toCharArray();
		for(int i=0;i<s.length;i++) {
			switch (s[i]) {
			case 'N':
				y++;
				break;
			case 'S':
				y--;
				break;
			case 'E':
				x++;
				break;
			case 'W':
				x--;
				break;
			}
		}
		System.out.println(Math.sqrt(x*x+y*y));
	}

}