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.*;

public class cf126b {
	public static void main(String[] args) throws Exception {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
		String s = in.readLine().trim();
		int n = s.length();
		int[] z = genZValues(s);
		int[] v = new int[n];
		for(int i=1; i<s.length(); i++)
			v[i] = Math.max(z[i],v[i-1]);
		int ret = 0;
		for(int i=1; i<s.length(); i++) {
			int j = s.length()-i;
			if(z[j] < i) continue;
			int k = j-1;
			if(k < 1)
				break;
			if(v[k] >= i)
				ret = i;
		}
		if(ret==0)
			out.println("Just a legend");
		else
			out.println(s.substring(0,ret));
		out.close();
	}
	static int[] genZValues(String s) {
		int g=0,f=0,N=s.length();
		int[] z = new int[N];
		for(int i=1; i<N; i++) 
			if(i<g && z[i-f]!=g-i)
				z[i] = Math.min(z[i-f],g-i);
			else {
				for(g=Math.max(g,f=i);g<N && s.charAt(g)==s.charAt(g-f); g++);
				z[i] = g-f;
			}
		return z;		
	}
}