main(e,n,i){
	char s[105];
	e=0;n=0;
	scanf("%s",s);
	for (i=0;s[i];i++){
		s[i]=='N'?n++:n;
		s[i]=='E'?e++:e;
		s[i]=='W'?e--:e;
		s[i]=='S'?n--:n;
	}
	printf("%lf",(double)sqrt(e*e+n*n));
}