
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main
{
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
    static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    }

    public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main
{
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
    static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    }

    public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    }
} Main static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    } isPalindrome {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    } int i = 0 i 0 j = str.length() - 1; j str.length() - 1 str.length() str.length str 1 while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        } i < j i j {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        } if (str.charAt(i) != str.charAt(j))
                return false; str.charAt(i) != str.charAt(j) str.charAt(i) str.charAt str i str.charAt(j) str.charAt str j return false; false i++ i j-- j return true; true String str str public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    } main {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    } FastReader obj = new FastReader(); obj new FastReader() StringBuffer str = new StringBuffer(obj.next()); str new StringBuffer(obj.next()) int left = (str.length()-1)/2 left (str.length()-1)/2 (str.length()-1) str.length() str.length str 1 2 right = (str.length()+3)/2; right (str.length()+3)/2 (str.length()+3) str.length() str.length str 3 2 if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        } isPalindrome(str.toString()) isPalindrome str.toString() str.toString str {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        } if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            } isPalindrome(str.substring(0,left)) isPalindrome str.substring(0,left) str.substring str 0 left {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            } if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                } isPalindrome(str.substring(right-1,str.length())) isPalindrome str.substring(right-1,str.length()) str.substring str right-1 right 1 str.length() str.length str {
                    System.out.println("Yes");
                    return;
                } System.out.println("Yes") System.out.println System.out System System.out "Yes" return; System.out.println("No") System.out.println System.out System System.out "No" String args[] args static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    } FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } FastReader {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        } br = new BufferedReader(new
                    InputStreamReader(System.in)) br new BufferedReader(new
                    InputStreamReader(System.in)) String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } next {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        } while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    st = new StringTokenizer(br.readLine());
                } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
            return Long.parseLong(next());
        } nextLong {
            return Long.parseLong(next());
        } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
            return Double.parseDouble(next());
        } nextDouble {
            return Double.parseDouble(next());
        } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } nextLine {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        } String str = ""; str "" try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                str = br.readLine();
            } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main
{
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
    static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    }

    public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    }
} public class Main
{
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
    static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    }

    public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    }
} Main

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main
{
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
    static boolean isPalindrome(String str)
    {
        int i = 0, j = str.length() - 1;

        while (i < j)
        {
            if (str.charAt(i) != str.charAt(j))
                return false;
            i++;
            j--;
        }
        return true;
    }

    public static void main(String args[])
    {
        FastReader obj = new FastReader();
        StringBuffer str = new StringBuffer(obj.next());
        int left = (str.length()-1)/2,right = (str.length()+3)/2;
        if(isPalindrome(str.toString()))
        {
            if(isPalindrome(str.substring(0,left)))
            {
                if(isPalindrome(str.substring(right-1,str.length())))
                {
                    System.out.println("Yes");
                    return;
                }
            }
        }
        System.out.println("No");
    }
}
