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.*;

public class Main {
    private static int[] genZBoxes(String s) {
        int n = s.length(), l = 0, r = 0;
        int[] z = new int[n];
        z[0] = n;
        for (int i = 1; i < n; ++i) {
            if (i <= r && z[i - l] < r - i + 1) {
                z[i] = z[i - l];
            } else {
                if (i > r) {
                    r = i;
                }
                l = i;
                while (r < n && s.charAt(r - l) == s.charAt(r))
                    ++r;
                z[i] = r - l;
                --r;
            }
        }
        return z;
    }

    public static void solve(String s) {
        int[] z = genZBoxes(s);
        int maxZ = 0, start = 0;
        for (int i = 1; i < s.length(); ++i) {
            if (z[i] == s.length() - i && maxZ >= s.length() - i) {
                start = i;
                break;
            }
            maxZ = Math.max(maxZ, z[i]);
        }
        if (start == 0) {
            Stream.out.println("Just a legend");
        } else {
            Stream.out.println(s.substring(start));
        }
        Stream.out.flush();
    }

    public static void main(String[] args) {
        String s = Stream.in.next();
        Main.solve(s);
    }
}

class Stream {
    static class InputClass {
        static BufferedReader reader = new BufferedReader(
                new InputStreamReader(System.in));
        static StringTokenizer tokenizer = new StringTokenizer("");

        public boolean hasNext() {
            try {
                while (!tokenizer.hasMoreTokens()) {
                    String line = reader.readLine();
                    if (line == null)
                        return false; // end of file
                    tokenizer = new StringTokenizer(line);
                }
            } catch (Exception e) {
            }
            return true;
        }

        public String next() {
            String ret = null;
            try {
                ret = hasNext() ? tokenizer.nextToken() : null;
            } catch (Exception e) {
            }
            return ret;
        }

        public String nextLine() {
            String ret = null;
            try {
                ret = reader.readLine();
            } catch (Exception e) {
            }
            return ret;
        }

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

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

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

    public static final InputClass in = new InputClass();

    public static final PrintWriter out = new PrintWriter(
            new OutputStreamWriter(System.out));
}