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()
n=len(s)
p=[-1]*n
mark=[False]*n
q=-1
for i in range(1,n):
    while q>=0 and s[i]!=s[q+1]:
        q=p[q]
    if s[i] == s[q + 1]:
        q += 1
        p[i] = q
    if q>=0 and i<n-1:
        mark[q]=True
#print(p)
q=p[n-1]
while q>=0:
    if s[0:q+1]==s[n-q-1:] and mark[q]:
        print(s[0:q+1])
        exit()
    q=p[q]
print('Just a legend')