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:
import sys
import random
import bisect
from collections import deque
#sys.setrecursionlimit(10**6)
from queue import PriorityQueue
from math import gcd
input_ = lambda: sys.stdin.readline().strip("\r\n")
ii = lambda : int(input_())
il = lambda : list(map(int, input_().split()))
ilf = lambda : list(map(float, input_().split()))
ip = lambda : input_()
fi = lambda : float(input_())
ap = lambda ab,bc,cd : ab[bc].append(cd)
li = lambda : list(input_())
pr = lambda x : print(x)
prinT = lambda x : print(x)
f = lambda : sys.stdout.flush()
mod = 10**9 + 7

def zfunc(s) :
    n = len(s)
    z = [0 for i in range(n)]

    l = 0
    r = 0

    for i in range (1,n) :
        if (i<=r) :
            z[i] = min(r-i+1, z[i-l])

        while (i+z[i] < n) and (s[z[i]] == s[i + z[i]]) :
            z[i] += 1

        if (i+z[i]-1 > r) :
            l = i
            r = i+z[i]-1

    return z

s = ip()
n = len(s)

mn = zfunc(s)

#print(mn)
fl = 1

x1 = -1

for i in range (1,n) :
    if (i + mn[i]) == n :
        if (x1 >= mn[i]) :
            print(s[i:])
            fl = 0
            break
    x1 = max(x1,mn[i])

if (fl) :
    print("Just a legend")