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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class D {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        run(s);
        int n = s.length();
        int max = 0 , t =0;
        for(int i = 1;i < n;i++)
            if(z[i] == n-i && max >= z[i])
            {
                t = n-i;
                break;
            }else
                max = Math.max(z[i] , max);
        if(t > 0)
            System.out.println(s.substring(0 , t));
        else
            System.out.println("Just a legend");
    }

    static int[] z;
    static void run(String str)
    {
        char[] s = str.toCharArray();
        int n = s.length;
        z = new int[n];
        int L = 0, R = 0;
        for (int i = 1; i < n; i++)
        {
            if (i > R)
            {
                L = R = i;
                while (R < n && s[R - L] == s[R])
                    R++;
                z[i] = R - L;
                R--;
            } else
            {
                int k = i - L;
                if (z[k] < R - i + 1)
                    z[i] = z[k];
                else
                {
                    L = i;
                    while (R < n && s[R - L] == s[R])
                        R++;
                    z[i] = R - L;
                    R--;
                }
            }
        }
    }
}
