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.util.*;
public class Task1{
	public static boolean s_i_a(String str, String input, int[] array){
		int i=0;
		int j=0;
		while(i < str.length() && j < input.length() - 3){
			if(str.charAt(i) == input.charAt(j)){
				i++; j++;
			}
			else{
				if(j != 0) j = array[j - 1];
				else i++;
			}
			if(j == input.length()) return true;
		}
		return false;
	}
	
	static int[] a;
	public static void fix(String input, int[] array){
		array[0] = 0;
		int index = 0;
		for(int i = 1; i < input.length();)
		{
			if(input.charAt(i) == input.charAt(index))
			{
				array[i] = index + 1;
				index++; i++;
				a[index]++;
			}
			else
			{
				if(index != 0)
					index = array[index - 1];
				else
				{
					array[i] = 0;
					i++; a[0]++;
				}
			}
		}
	}
	
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		String input = scan.nextLine();
		int[] array = new int[input.length()];
		a = new int[input.length()];
		fix(input,array);
		int l = array[input.length() - 1];
		if(l > 0 && a[l] < 2) l = array[l - 1];
		if(l == 0) System.out.println("Just a legend");
		else System.out.println(input.substring(0, l));
	}
}