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 find_fail(P):
    m = len(P)
    f = [0]*m
    j = 1
    k = 0
    while j < m:
     if P[j] == P[k]:
        f[j] = k+1
        j += 1
        k += 1
     elif k > 0:
        k = f[k-1]
     else:
        j += 1
    return f

s = input()
fail = [0]*len(s)
fail = find_fail(s)
maximam = fail.pop()
if maximam == 0:
    print ("Just a legend")
else:
  if maximam in fail:
    print (s[:maximam])
  elif fail[maximam - 1]:
    print (s[:fail[maximam - 1]])
  else:
    print ("Just a legend")     