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 Password {
	
	static int[] z;

	public static void Z(StringBuilder s) {
		int L = 0, R = 0;
		int n = s.length();
		z = new int[n];
		for (int i = 1; i < n; i++) {
			if (i > R) {
				L = R = i;
				while (R < n && s.charAt(R - L) == s.charAt(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.charAt(R - L) == s.charAt(R))
						R++;
					z[i] = R - L;
					R--;
				}
			}
		}
	}
	
	public static void main(String[] args) throws IOException {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		StringBuilder s = new StringBuilder(bf.readLine());
		if(s.length()<3){
			System.out.println("Just a legend");
			return;
		}
		Z(s);
		int max = 0;
		int index = -1;
		for (int i = 1; i < z.length; i++) {
			if(z[i]==s.length()-i && max>=z[i]){
				index = i;
				break;
			}
			max = Math.max(max, z[i]);
		}
		if(index==-1)
			System.out.println("Just a legend");
		else
			System.out.println(s.substring(index));
	}
}
