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 sys, math
input = sys.stdin.readline

def getInts():
    return [int(s) for s in input().split()]

def getInt():
    return int(input())

def getStrs():
    return [s for s in input().split()]

def getStr():
    return input().strip()

def listStr():
    return list(input().strip())

import collections as col
import math

#abcabcabca
#defejjdefedefe

def solve():
    S = getStr()
    N = len(S)
    T = [0]*N
    pos = 1
    cnd = 0
    while pos < N:
        if S[pos] == S[cnd]:
            cnd += 1
            T[pos] = cnd
            pos += 1
        else:
            if cnd:
                cnd = T[cnd-1]
            else:
                T[pos] = 0
                pos += 1
    temp = T[-1]
    if T[-1] != 0 and T.count(temp) >= 2:
        return ''.join(S[:temp])
    elif T[-1] != 0 and T[T[-1]-1] > 0:
        return ''.join(S[:T[T[-1]-1]])
     
    return "Just a legend"



    
#for _ in range(getInt()):
print(solve())
    

