Problem: 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

Solution (in JAVA):

Solution:
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.FilterInputStream;
import java.io.BufferedInputStream;
import java.io.InputStream;

/**
 * @author khokharnikunj8
 */
public class Main {
        public static void main(String[] args) {
                new Thread(null, new Runnable() {
                        public void run() {
                                new Main().solve();
                        }
                }, "1", 1 << 26).start();
        }

        void solve() {
                InputStream inputStream = System.in;
                OutputStream outputStream = System.out;
                ScanReader in = new ScanReader(inputStream);
                PrintWriter out = new PrintWriter(outputStream);
                BPassword solver = new BPassword();
                solver.solve(1, in, out);
                out.close();
        }

        static class BPassword {
                private int[] lps;

                private void preprocess(String s) {
                        lps = new int[s.length()];
                        int len = 0;
                        int i = 1;
                        while (i < s.length()) {
                                if (s.charAt(i) == s.charAt(len)) {
                                        len++;
                                        lps[i] = len;
                                        i++;
                                } else {
                                        if (len == 0) i++;
                                        else len = lps[len - 1];
                                }
                        }
                }

                public void solve(int testNumber, ScanReader in, PrintWriter out) {
                        String s = in.scanString();
                        preprocess(s);
                        int max = lps[s.length() - 1];
                        int ans = -1;
                        for (int i = 1; i < s.length() - 1; i++)
                                if (lps[i] == max && lps[i] > ans) ans = lps[i];
                        if (ans == -1 && max != 0)
                                for (int i = 1; i < s.length() - 1; i++)
                                        if (lps[i] == lps[max - 1] && lps[i] > ans) ans = lps[i];
                        if (ans == -1 || ans == 0) out.println("Just a legend");
                        else out.println(s.substring(0, ans));
                }

        }

        static class ScanReader {
                private byte[] buf = new byte[4 * 1024];
                private int index;
                private BufferedInputStream in;
                private int total;

                public ScanReader(InputStream inputStream) {
                        in = new BufferedInputStream(inputStream);
                }

                private int scan() {
                        if (index >= total) {
                                index = 0;
                                try {
                                        total = in.read(buf);
                                } catch (Exception e) {
                                        e.printStackTrace();
                                }
                                if (total <= 0) return -1;
                        }
                        return buf[index++];
                }

                public String scanString() {
                        int c = scan();
                        if (c == -1) return null;
                        while (isWhiteSpace(c)) c = scan();
                        StringBuilder res = new StringBuilder();
                        do {
                                res.appendCodePoint(c);
                                c = scan();
                        } while (!isWhiteSpace(c));
                        return res.toString();
                }

                private boolean isWhiteSpace(int n) {
                        if (n == ' ' || n == '\n' || n == '\r' || n == '\t' || n == -1) return true;
                        else return false;
                }

        }
}