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.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.OutputStream;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.BufferedOutputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Aeroui
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Kattio in = new Kattio(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        int[] cnt;

        public void solve(int testNumber, Kattio in, PrintWriter out) {
            char[] arr = in.next().toCharArray();

            cnt = new int[arr.length + 1];
            int[] z = z_function(arr);

            int ans = -1;
            for (int i = arr.length - 1; i > 0; --i) {
                if (i + z[i] == arr.length && z[i] > 0 && cnt[z[i]] > 1) {
                    ans = z[i];
                }
            }

            if (ans == -1) {
                out.println("Just a legend");
            } else {
                for (int i = 0; i < ans; ++i) {
                    out.print(arr[i]);
                }
                out.println();
            }
        }

        public int[] z_function(char[] arr) {
            int n = arr.length;
            int[] 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);
                ++cnt[z[i]];
                while (i + z[i] < n && arr[z[i]] == arr[i + z[i]]) {
                    ++z[i];
                    ++cnt[z[i]];
                }

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

            return z;
        }

    }

    static class Kattio extends PrintWriter {
        private BufferedReader r;
        private String line;
        private StringTokenizer st;
        private String token;

        public Kattio(InputStream i) {
            super(new BufferedOutputStream(System.out));
            r = new BufferedReader(new InputStreamReader(i));
        }

        public Kattio(InputStream i, OutputStream o) {
            super(new BufferedOutputStream(o));
            r = new BufferedReader(new InputStreamReader(i));
        }

        public String next() {
            return nextToken();
        }

        private String peekToken() {
            if (token == null)
                try {
                    while (st == null || !st.hasMoreTokens()) {
                        line = r.readLine();
                        if (line == null) return null;
                        st = new StringTokenizer(line);
                    }
                    token = st.nextToken();
                } catch (IOException e) {
                }
            return token;
        }

        private String nextToken() {
            String ans = peekToken();
            token = null;
            return ans;
        }

    }
}