import java.util.Scanner;
public class Main{
	public static void main(String args[])throws Exception{
		Scanner sc=new Scanner(System.in);
		char c[]=sc.nextLine().toCharArray();
		int x=0,y=0;

		for(int i=0;i<c.length;i++){
			switch(c[i]){
			case'N':y--;break;
			case'E':x++;break;
			case'S':y++;break;
			case'W':x--;break;
			}
		}
		System.out.println(Math.sqrt((x*x)+(y*y)));
	}
}