import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String s = sc.next(); s sc.next() sc.next sc int len = s.length(); len s.length() s.length s String ans = "Yes"; ans "Yes" for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    } int i = 0; int i = 0; i 0 i < len / 2 i len / 2 len 2 i++ i++ i {
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    } {
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    } if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } s.charAt(i) != s.charAt((len / 2) - 1 - i) s.charAt(i) s.charAt s i s.charAt((len / 2) - 1 - i) s.charAt s (len / 2) - 1 - i (len / 2) - 1 - i (len / 2) len 2 1 i {
        ans = "No";
        break;
      } ans = "No" ans "No" break; if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i) s.charAt((len / 2) + 1 + i) s.charAt s (len / 2) + 1 + i (len / 2) + 1 + i (len / 2) len 2 1 i s.charAt((len / 2) - 1 - i) s.charAt s (len / 2) - 1 - i (len / 2) - 1 - i (len / 2) len 2 1 i {
        ans = "No";
        break;
      } ans = "No" ans "No" break; System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    String s = sc.next();
    int len = s.length();
    String ans = "Yes";

    for(int i = 0; i < len / 2; i++){
      if(s.charAt(i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      } else if(s.charAt((len / 2) + 1 + i) != s.charAt((len / 2) - 1 - i)){
        ans = "No";
        break;
      }
    }

    System.out.println(ans);
  }
}
