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:
def compute_KMP_fail(P):
    m = len(P)
    fail = [0]*m
    i = 1
    j = 0
    while i<m:
        if P[i] == P[j]:
            fail[i] = j+1
            i += 1
            j += 1
        elif j>0:
            j = fail[j-1]
        else:
            fail[i] = 0
            i += 1
    return fail

s = str(input())
F = compute_KMP_fail(s)
if F[-1] == 0:
    print('Just a legend')
else:
    for i in range(0,len(s)-1):
        if F[i] == F[-1]:
            print(s[0:F[-1]])
            exit()
    else:
        if F[F[-1]-1]>0:
            print(s[0:F[F[-1]-1]])
        else:
            print('Just a legend')