import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No00000113_Main2 {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String[] arr = br.readLine().split("");
		int x = 0;
		int y = 0;
		for(String s : arr) {
			switch(s) {
			case "N":
				y++;
				break;
			case "E":
				x++;
				break;
			case "W":
				x--;
				break;
			case "S":
				y--;
				break;
			default:
				break;
			}
		}

		System.out.println(Math.sqrt(x * x + y * y));

	}

}