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
from sys import stdin


def findpass(s):
    arr = suff_array(s)
    n = len(s)
    maxidx = arr[n - 1]
    valid = False

    for i in range(n - 1):
        if arr[i] == maxidx:
            valid = True
            break

    if not valid:
        maxidx = arr[maxidx - 1]

    if maxidx == 0:
        return "Just a legend"
    return s[:maxidx]


def suff_array(s):
    n = len(s)
    table = [0] * n

    pos, i = 0, 1

    while i < n:
        if s[pos] == s[i]:
            table[i] = pos + 1
            pos += 1
            i += 1
        elif pos == 0:
            i += 1
        else:
            pos = table[pos - 1]


#    print(table)
    return table

if __name__ == "__main__":
    s = stdin.readline().strip()
    print(findpass(s))
