import java.util.Scanner;
import java.util.HashMap;

public class yukicoder_113 {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		
		String str = stdIn.next();
		String[] array = new String[str.length()];
		
		HashMap<String, Integer> map = new HashMap<String, Integer>();
		map.put(str.substring(0, 1), 1);
		
		for (int i = 1; i < array.length; i++) {
			array[i] = str.substring(i, i + 1);
			
			if (map.containsKey(array[i])) {
				map.put(array[i], map.get(array[i]) + 1);
			} else {
				map.put(array[i], 1);
			}
		}
		
		int north = 0, east = 0, west = 0, south = 0;
		
		if (map.get("N") != null) {
			north = map.get("N") * 1;
		}
		
		if (map.get("E") != null) {
			east = map.get("E") * 1;
		}
		
		if (map.get("W") != null) {
			west = map.get("W") * (-1);
		}
		
		if (map.get("S") != null) {
			south = map.get("S") * (-1);
		}
		
		double height = Math.pow(Math.abs(north + south),2);
		double width = Math.pow(Math.abs(east + west),2);
		
		System.out.println(Math.sqrt(height + width));
	}
}