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
from math import ceil, log2
from collections import Counter
from sys import stdin
input = stdin.readline
def read(): return [int(i) for i in input().split()]

def run(s):
    i=1
    j=0
    arr = [0]
    n = len(s)
    while(i<n):
        if s[j]==s[i]:
            j+=1
            arr.append(j)
            i+=1
        else:
            if j!=0:
                j = arr[j-1]
            else:
                arr.append(0)
                i+=1
    #print(*arr)
    return arr


s = input().strip()
arr = run(s)
l = arr[-1]
if l!=0 and arr.count(l)>=2:
    print(s[:l])
elif l!=0 and arr[l-1]!=0:
    print(s[ : arr[l-1]])
else:
    print('Just a legend')
