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;
import java.util.Arrays;
import java.util.StringTokenizer;

public class D {

	public static void main(String[] args) throws IOException {
		InputReader in = new InputReader();
		String s = in.next();
		char[] a = s.toCharArray();
		size = a.length;
		F = new int[size + 1];
		preprocess(a);
		int x = F[size];
		if (x == 0)
			System.out.println("Just a legend");
		else {
			for (int i = 2; i < size; i++) {
				if (F[i] == x) {
					System.out.println(s.substring(0, x));
					return;
				}
			}
			String t;
			size = x;
			preprocess((t = s.substring(s.length() - x)).toCharArray());
			if (F[size] != 0) {
				System.out.println(t.substring(t.length() - F[size]));
				return;
			}
			System.out.println("Just a legend");
		}
	}

	static int size;
	static int[] F;

	public static void preprocess(char[] p) {
		F[0] = F[1] = 0;
		int j;
		for (int i = 2; i <= size; i++) {
			j = F[i - 1];
			while (true) {
				if (p[j] == p[i - 1]) {
					F[i] = j + 1;
					break;
				}
				if (j == 0) {
					F[i] = 0;
					break;
				}
				j = F[j];
			}
		}
	}

	static class InputReader {
		BufferedReader in;
		StringTokenizer st;

		public InputReader() throws IOException {
			in = new BufferedReader(new InputStreamReader(System.in));
			st = new StringTokenizer(in.readLine());
		}

		public String next() throws IOException {
			while (!st.hasMoreElements())
				st = new StringTokenizer(in.readLine());
			return st.nextToken();
		}

		public int nextInt() throws NumberFormatException, IOException {
			return Integer.parseInt(next());
		}

		public long nextLong() throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}
	}
}