import java.util.Scanner;
public class No113 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String st = sc.next();
		int NCount =0;
		int ECount =0;
			
		for(int i=0; i<st.length(); i++){
			switch(st.charAt(i)){
			case 'N':
				NCount++;
				break;
			case 'S':
				NCount--;
				break;
			case 'E':
				ECount++;
				break;
			case 'W':
				ECount--;
				break;
			}
		}
		System.out.println(Math.sqrt(Math.pow(ECount,2)+Math.pow(NCount,2)));
	}
}