public class No_113 {
	static int X;
	static int Y;

	static void move(char c) {
		switch (c) {
		case 'N':
			Y++;
			break;
		case 'E':
			X++;
			break;
		case 'S':
			Y--;
			break;
		case 'W':
			X--;
			break;

		}
	}

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		String s = sc.next();
		char[] direction = s.toCharArray();

		for (char c : direction) {
			move(c);
		}

		System.out.println(Math.sqrt(X * X + Y * Y));
		sc.close();

	}

}