import java.util.*;
public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
        String S = sc.next();
        char[]ss = S.toCharArray();

        int cou = 0;
        for(int i=0; i<S.length()/2; i++){
            if(ss[i]!=ss[S.length()-1-i]){
                cou++;
    }
}
        for(int i=0; i<(S.length()-1)/2/2; i++){
            if(ss[i]!=ss[(S.length()-1)/2-1-i]){
                cou++;
    }
}
         for(int i=((S.length()+3)/2)-1; i<S.length(); i++){
            if(ss[((S.length()+3)/2)-1]!=ss[S.length()-1]){
                cou++;
    }
}
        if(cou==0){
            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