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 password(str):
    lst = [0]*len(str)
    n = 0
    for i in range(1, len(str)):
        while n > 0 and str[n] != str[i]:
            n = lst[n - 1]
        if str[n] == str[i]:
            n += 1
            lst[i] = n
        else:
            lst[i] = n
    return lst



x = None
in_c = input()
lst = password(in_c)
var = lst[len(in_c) - 1]
if var != 0:
    for j in range(2):
        for i in range(1, len(in_c) - 1):
            if var == lst[i]:
                x = True
                break
        if not x:
            var = lst[var-1]
            if var == 0:
                break
        else:
            break
if not x or var == 0:
    print("Just a legend")
else:
    print(in_c[0:var])