import java.util.*;
public class Main {
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		StringBuffer S_temp =new StringBuffer(S);
		String S_r = new String(S_temp.reverse());
		int N = S.length();
		StringBuffer s1_temp = new StringBuffer(S.substring(0, (N - 1) / 2));
		String s1 = new String(s1_temp);
		String  s1_r = new String(s1_temp.reverse());
		StringBuffer s2_temp = new StringBuffer(S.subSequence((N + 3) / 2 - 1, N));
		String s2 = new String(s2_temp);
		String  s2_r = new String(s2_temp.reverse());
		if(S.equals(S_r) && s1.equals(s1_r) && s2.equals(s2_r)){
			System.out.println("Yes");
		} else {
			System.out.println("No");
		}
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz