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 sys import stdin, stdout

def read():
    return stdin.readline().rstrip()

def solve(s, z):
    maxi = 0
    pos = 0
    for i in range(1, len(s)):
        rev_idx = len(s) - i
        if z[i] == rev_idx and maxi >= rev_idx:
            pos = i
            break
        maxi = max(maxi, z[i])
    else:
        return False
    return s[pos:]

def zf(s):
    n = len(s)
    z = [0]*n
    L = R = 0
    for i in range(1, n):
        if i <= R:
            z[i] = min(z[i-L], R-i+1)
        while i+z[i] < n and s[i+z[i]] == s[z[i]]:
            z[i] += 1
        if i+z[i]-1 > R:
            L, R = i, i+z[i]-1
    #print(solve(s, z))
    return solve(s, z)

password = zf(read())
stdout.write("Just a legend\n" if not password else password+"\n")