public static void main(String[] args) {

    Scanner sc=new Scanner(System.in);
    String A=sc.next();
    int len = 0;
    /* Enter your code here. Print output to STDOUT. */
    for(int i = A.length()-1; i>=(A.length())/2; i--){
        if(A.charAt(i) != A.charAt(len)){
            System.out.println("No");
            return;
        }
        len++;
    }
    System.out.println("Yes");
}