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
def lcp(text):
    length = len(text)
    lis = [0]*length
    j = 1
    k = 0
    while j < length:
        if text[j] == text[k]:
            lis[j] = k+1
            j+=1
            k+=1
        elif k>0:
            k = lis[k-1]
        else:
            j+=1
    return lis

text = input()
length = len(text)
lis = lcp(text)
idf = 0
for i in range(length-1):
    if lis[i] == lis[-1] and lis[i] != 0:
        print(text[0:lis[i]])
        idf = 1
        break

if idf == 0:
    if lis[-1] == 0 :
        print('Just a legend')
    else:
        maximum = lis[lis[-1]-1]
        if maximum == 0:
            print('Just a legend')
        else:
            print(text[0:maximum])