Asterix, Obelix and their temporary buddies Suffix and Prefix has finally found the Harmony temple. However, its doors were firmly locked and even Obelix had no luck opening them.

A little later they found a string s, carved on a rock below the temple's gates. Asterix supposed that that's the password that opens the temple and read the string aloud. However, nothing happened. Then Asterix supposed that a password is some substring t of the string s.

Prefix supposed that the substring t is the beginning of the string s; Suffix supposed that the substring t should be the end of the string s; and Obelix supposed that t should be located somewhere inside the string s, that is, t is neither its beginning, nor its end.

Asterix chose the substring t so as to please all his companions. Besides, from all acceptable variants Asterix chose the longest one (as Asterix loves long strings). When Asterix read the substring t aloud, the temple doors opened. 

You know the string s. Find the substring t or determine that such substring does not exist and all that's been written above is just a nice legend.

Input

You are given the string s whose length can vary from 1 to 106 (inclusive), consisting of small Latin letters.

Output

Print the string t. If a suitable t string does not exist, then print "Just a legend" without the quotes.

Examples

Input

fixprefixsuffix


Output

fix

Input

abcdabc


Output

Just a legend
/*
								"जय श्री कृष्णा"
*/
import java.util.*;
import java.io.*;

public class Password_DP implements Runnable
{

    static class FastReader
    {
        BufferedReader br;
        StringTokenizer st;

        public FastReader()
        {
            this.br = new BufferedReader(new InputStreamReader(System.in));
        }
        public FastReader(String s)
        {
            try
            {
                this.br = new BufferedReader(new FileReader(s));
            }
            catch (FileNotFoundException e)
            {
                e.printStackTrace();
            }
        }

        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;
        }

        int[] nextIntArray(int size)
        {
            int[] arr = new int[size];
            for (int i = 0; i < size; ++i)
                arr[i] = nextInt();
            return arr;
        }

        long[] nextLongArray(int size)
        {
            long[] arr = new long[size];
            for (int i = 0; i < size; ++i)
                arr[i] = nextLong();
            return arr;
        }

        double[] nextDoubleArray(int size)
        {
            double[] arr = new double[size];
            for (int i = 0; i < size; ++i)
                arr[i] = nextDouble();
            return arr;
        }
    }
    static class FastWriter
    {
        PrintWriter pw;

        public FastWriter()
        {
            this.pw = (new PrintWriter(new BufferedOutputStream(System.out)));
        }

        public FastWriter(String s)
        {
            try
            {
                this.pw = new PrintWriter(new File(s));
            }
            catch (FileNotFoundException e)
            {
                e.printStackTrace();
            }
        }

        public void print(Object object)
        {
            pw.append("" + object);
        }

        public void println(Object object)
        {
            print(object);
            pw.append("\n");
        }

        public void println()
        {
            pw.append("\n");
        }

        public void close()
        {
            pw.close();
        }

        public void flush()
        {
            pw.flush();
        }

    }


    static int mod = (int) (1e9 + 7), N = (int) (1e5), INF = Integer.MAX_VALUE, NINF = Integer.MIN_VALUE;
    static final FastReader fr = new FastReader();
    static final FastWriter out = new FastWriter();
    public static void main(String[] args) throws java.lang.Exception
    {
        new Thread(null, new Password_DP(), "Main", 1 << 26).start();
    }

    int[] z_function(String s)
    {
        int n = s.length(), z[] = new int[n];

        for(int i = 1, l = 0, r = 0; i < n; ++i)
        {

            if(i <= r)
                z[i] = Math.min(z[i - l], r - i + 1);

            while(i + z[i] < n && s.charAt(z[i]) == s.charAt(i + z[i]))
                ++z[i];

            if(i + z[i] - 1 > r)
            {
                l = i;
                r = i + z[i] - 1;
            }

        }

        return z;
    }


    void solve()
    {
        String s = fr.next();
        int z[] = z_function(s), n = s.length();
        int f[] = new int[n];

        int resultant_length = -1, max = NINF;
        for(int i = 1; i < n; ++i)
        {
            if(z[i] == n - i && max >= z[i])
            {
                resultant_length = z[i];
                break;
            }
            max = Math.max(max, z[i]);
        }

        out.print(resultant_length == -1 ? "Just a legend" : s.substring(0, resultant_length));


    }
    @Override
    public void run()
    {
        long start = System.nanoTime(); // Program Start
        boolean testcase = false;
        int t = testcase ? fr.nextInt() : 1;
        while (t-- > 0)
        {
            solve();
            out.print("\n");
            out.flush();

        }
        long end = System.nanoTime(); // Program End
        // System.err.println("Time taken: " + (end - start) / 1000000 + " ms");
    }

    static class CP
    {

        static boolean isPrime(long n)
        {
            if (n <= 1)
                return false;
            if (n == 2 || n == 3)
                return true;
            if (n % 2 == 0 || n % 3 == 0)
                return false;
            for (int i = 5; i * i <= n; i += 6)
            {
                if (n % i == 0 || n % (i + 2) == 0)
                    return false;
            }
            return true;
        }
        static List<Integer> sieve(int size)
        {
            ArrayList<Integer> pr = new ArrayList<Integer>();
            boolean prime[] = new boolean[size];
            for(int i = 2; i < prime.length; i++)  prime[i] = true;
            for(int i = 2; i * i < prime.length; i++)
            {
                if(prime[i])
                {
                    for(int j = i * i; j < prime.length; j += i)
                    {
                        prime[j] = false;
                    }
                }
            }
            for(int i = 2; i < prime.length; i++) if(prime[i]) pr.add(i);
            return pr;
        }

        static long binary_Expo(long a, long b)   // calculating a^b
        {
            long res = 1;
            while (b != 0)
            {
                if ((b & 1) == 1)
                {
                    res *= a;
                    --b;
                }
                a *= a;
                b /= 2;
            }
            return res;
        }

        static long Modular_Expo(long a, long b)
        {
            long res = 1;
            while (b != 0)
            {
                if ((b & 1) == 1)
                {
                    res = (res * a) % mod;
                    --b;
                }
                a = (a * a) % mod;
                b /= 2;
            }
            return res;
        }

        static int i_gcd(int a, int b)  // iterative way to calculate gcd.
        {
            while (true)
            {
                if (b == 0)
                    return a;
                int c = a;
                a = b;
                b = c % b;
            }
        }

        static long gcd(long a, long b)  // here b is the remainder
        {
            if (b == 0)
                return a; //because each time b will divide a.
            return gcd(b, a % b);
        }

        static long ceil_div(long a, long b)   // a numerator b denominator
        {
            return (a + b - 1) / b;
        }

        static int getIthBitFromInt(int bits, int i)
        {
            return (bits >> (i - 1)) & 1;
        }

        static int upper_Bound(int a[], int x)  //closest to the left+1
        {
            int l = -1, r = a.length;
            while (l + 1 < r)
            {
                int m = (l + r) >>> 1;
                if (a[m] <= x)
                    l = m;
                else
                    r = m;
            }
            return l + 1;
        }

        static int lower_Bound(int a[], int x)  //closest to the right
        {
            int l = -1, r = a.length;
            while (l + 1 < r)
            {
                int m = (l + r) >>> 1;
                if (a[m] >= x)
                    r = m;
                else
                    l = m;
            }
            return r;
        }
        static boolean isSquarefactor(int x, int factor, int target)
        {
            int s = (int)Math.round(Math.sqrt(x));
            return factor * s * s == target;
        }

        static boolean isSquare(int x)
        {
            int s = (int)Math.round(Math.sqrt(x));
            return x * x == s;
        }
        static void sort(int a[])
        {
            PriorityQueue<Integer> q = new PriorityQueue<>();
            for (int i = 0; i < a.length; i++)
                q.add(a[i]);
            for (int i = 0; i < a.length; i++)
                a[i] = q.poll();
        }

        static int getMax(int arr[], int n)
        {
            int mx = arr[0];
            for (int i = 1; i < n; i++)
                if (arr[i] > mx)
                    mx = arr[i];
            return mx;
        }
    }

}
