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)
lps=[0]*(n)
i=1 
length=0 
while i<n:
    if s[i]==s[length]:
        length+=1 
        lps[i]=length 
        i+=1 
    else:
        if length==0:
            i+=1
            
            
        else:
            length=lps[length-1]
x=lps[-1]
flag=1
while x:
    
    
    for i in range(1,n-1):
        if lps[i]==x:
            flag=0
            break
        else:
            flag=1
    if flag==0:
        break
    x=lps[x-1]


print(s[:x]) if flag==0 else print('Just a legend')