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:
s = input()
t = [0]
i, length = 1, 0

while i < len(s):
    if s[i] == s[length]:
        length += 1
        t.append( length)
        i += 1
    else:
        if length == 0:
            t.append(length)
            i += 1
        else:
            length = t[length-1]
#print(t)
if t[-1] != 0:
    if len([a for a in t if a == t[-1]]) >= 2:
        print(s[:t[-1]])
    else:
        q = t[t[-1]-1]
        if q != 0:
            print(s[:q])
        else:
            print('Just a legend')
else:
    print('Just a legend')