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:
def prefix(s):
    p = [0] * len(s)
    for i in range(1, len(s)):
        k = p[i - 1]
        while k > 0 and s[k] != s[i]:
            k = p[k - 1]
        if s[k] == s[i]:
            k += 1
        p[i] = k
    return p


string = input()
prefix_values = prefix(string)
n = len(string)
if prefix_values[n - 1] == 0:
    print('Just a legend')
    exit()

last_pr = prefix_values[n - 1]
for i in range(n - 1):
    if prefix_values[i] == last_pr:
        print(string[:prefix_values[i]])
        exit()

next_pos_value = prefix_values[last_pr - 1]
if next_pos_value == 0:
    print('Just a legend')
    exit()

for i in range(n):
    a = prefix_values[i]
    if prefix_values[i] == next_pos_value and i != last_pr:
        print(string[:prefix_values[i]])
        exit()

# print('Just a legend')