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
import java.io.*;
import java.util.*;
import java.math.*;

public class T implements Runnable {

    public void run() {
        long startTime = System.nanoTime();

        char[] c = nextToken().toCharArray();
        int n = c.length;

        long P = 100000009;
        long[] pow = new long[n + 1];
        pow[0] = 1;
        for (int i = 0; i < n; i++) {
            pow[i + 1] = pow[i] * P;
        }
        long[] h = new long[n + 1];
        for (int i = 0; i < n; i++) {
            h[i + 1] = h[i] + pow[i] * c[i];
        }
        int ind = 1, res = 0;
        for (int l = 1; l < n; l++) {
            while (ind + l < n && (h[l] - h[0]) * pow[ind] != h[ind + l] - h[ind]) {
                ind++;
            }
            if (ind + l >= n) {
                break;
            }
            if ((h[l] - h[0]) * pow[n - l] == h[n] - h[n - l]) {
                res = Math.max(res, l);
            }
        }
        if (res == 0) {
            println("Just a legend");
        } else {
            println(new String(c, 0, res));
        }

        if (fileIOMode) {
            System.out.println((System.nanoTime() - startTime) / 1e9);
        }
        out.close();
    }

    //-----------------------------------------------------------------------------------

    private static boolean fileIOMode;
    private static String problemName = "a";
    private static BufferedReader in;
    private static PrintWriter out;
    private static StringTokenizer tokenizer;

    public static void main(String[] args) throws Exception {
        fileIOMode = args.length > 0 && args[0].equals("!");
        if (fileIOMode) {
            in = new BufferedReader(new FileReader(problemName + ".in"));
            out = new PrintWriter(problemName + ".out");
        } else {
            in = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
        }
        tokenizer = new StringTokenizer("");

        new Thread(new T()).start();
    }

    private static String nextLine() {
        try {
            return in.readLine();
        } catch (IOException e) {
            return null;
        }
    }

    private static String nextToken() {
        while (!tokenizer.hasMoreTokens()) {
            tokenizer = new StringTokenizer(nextLine());
        }
        return tokenizer.nextToken();
    }

    private static int nextInt() {
        return Integer.parseInt(nextToken());
    }

    private static long nextLong() {
        return Long.parseLong(nextToken());
    }

    private static double nextDouble() {
        return Double.parseDouble(nextToken());
    }

    private static BigInteger nextBigInteger() {
        return new BigInteger(nextToken());
    }

    private static void print(Object o) {
        if (fileIOMode) {
            System.out.print(o);
        }
        out.print(o);
    }

    private static void println(Object o) {
        if (fileIOMode) {
            System.out.println(o);
        }
        out.println(o);
    }

    private static void printf(String s, Object... o) {
        if (fileIOMode) {
            System.out.printf(s, o);
        }
        out.printf(s, o);
    }
}
