class C{
	public static void main(String[]$){
		int x=0,y=0;
		for(char c:new java.util.Scanner(System.in).next().toCharArray()) {
			if(c=='N')++y;
			if(c=='E')++x;
			if(c=='W')--x;
			if(c=='S')--y;
		}
		System.out.println(Math.sqrt(x*x+y*y));
	}
}