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.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class D {

	public static void main(String[] args) throws IOException
	{	
		Scanner sc = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out); 
		char[] a = sc.next().toCharArray();
		int[] p = KMP(a);
		int n = a.length;
		if(p[n-1] == 0) {out.println("Just a legend"); out.flush(); return;}
		boolean found = false;
		for(int i = 1; i < n-1; i++)
			if(p[i] == p[n-1])
			{
				found = true;
				break;
			}
		if(found)
			for(int i = 0; i < p[n-1]; i++)
				out.print(a[i]);
		else if(p[p[n - 1] - 1] != 0)
			for(int i = 0; i < p[p[n - 1] - 1]; i++)
				out.print(a[i]);
		else out.println("Just a legend");
		out.flush();
		out.close();
	}
	
	static int[] KMP(char[] s)		
	{
		int n = s.length, p[] = new int[n];
		for(int i = 1, j = 0; i < n; ++i)		
		{
			while(j > 0 && s[i] != s[j])
				j = p[j-1];
			if(s[i] == s[j])
				++j;
			p[i] = j;
		}
		return p;
	}
	
	static class Scanner 
	{
		StringTokenizer st;
		BufferedReader br;

		public Scanner(InputStream System){	br = new BufferedReader(new InputStreamReader(System));	}
		public String next() throws IOException 
		{
			while (st == null || !st.hasMoreTokens()) 
				st = new StringTokenizer(br.readLine());
			return st.nextToken();
		}
		public String nextLine()throws IOException{return br.readLine();}
		public int nextInt() throws IOException {return Integer.parseInt(next());}
		public double nextDouble() throws IOException {return Double.parseDouble(next());}
		public char nextChar()throws IOException{return next().charAt(0);}
		public Long nextLong()throws IOException{return Long.parseLong(next());}
		public boolean ready() throws IOException{return br.ready();}
		public void waitForInput(){for(long i = 0; i < 3e9; i++);}
	}
}