Problem: 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

Solution (in PYTHON3):

Solution:
from collections import defaultdict, Counter,deque
from math import sqrt, log10, log, floor, factorial
from bisect import bisect_left, bisect_right
from itertools import permutations,combinations
import sys, io, os
input = sys.stdin.readline
# input=io.BytesIO(os.read(0,os.fstat(0).st_size)).readline
# print=sys.stdout.write
# sys.setrecursionlimit(10000)
inf = float('inf');
mod = 10 ** 9 + 7
def get_list(): return [int(i) for i in input().split()]
def yn(a): print("YES" if a else "NO")
ceil = lambda a, b: (a + b - 1) // b
def z_function(S):
    """
    Z Algorithm in O(n)
    :param S: text string to process
    :return: the Z array, where Z[i] = length of the longest common prefix of S[i:] and S
    """

    n = len(S)
    Z = [0] * n
    l = r = 0

    for i in range(1, n):
        z = Z[i - l]
        if i + z >= r:
            z = max(r - i, 0)
            while i + z < n and S[z] == S[i + z]:
                z += 1

            l, r = i, i + z

        Z[i] = z

    Z[0] = n
    return Z
t=1
for i in range(t):
    s=input().strip()
    z=z_function(s)
    l=sorted(z[1:])
    ans=-1
    for i in range(len(z)-1,0,-1):
        if z[i]==len(z)-i:

            if bisect_left(l,z[i])<len(l)-1:
                ans=z[i]
    if ans==-1:
        print("Just a legend")
    else:
        print(s[:ans])