import java.util.Scanner;
public class No113 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] s = sc.next().toCharArray();
		int x=0,y=0;
		for(int i=0;i<s.length;i++){
			y+=s[i]=='N'?1:s[i]=='S'?-1:0;
			x+=s[i]=='E'?1:s[i]=='W'?-1:0;
		}
		System.out.println(Math.abs(Math.sqrt(Math.pow(x, 2)+Math.pow(y, 2))));
	}
}