import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		int x = 0, y = 0;
		for(char c : sc.next().toCharArray()){
			if(c == 'N'){
				y--;
			}else if(c == 'S'){
				y++;
			}else if(c == 'W'){
				x--;
			}else if(c == 'E'){
				x++;
			}
		}
		
		System.out.printf("%.8f\n", Math.sqrt(x * x + y * y));
	}
	
}