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:
__author__ = 'Utena'
def compute_kmp_fail(P):
  """Utility that computes and returns KMP 'fail' list."""
  m = len(P)
  fail = [0] * m                   # by default, presume overlap of 0 everywhere
  j = 1
  k = 0
  while j < m:                     # compute f(j) during this pass, if nonzero
    if P[j] == P[k]:               # k + 1 characters match thus far
      fail[j] = k + 1
      j += 1
      k += 1
    elif k > 0:                    # k follows a matching prefix
      k = fail[k-1]
    else:                          # no match found starting at j
      j += 1
  return fail
t=input()
f=compute_kmp_fail(t)
m=f[-1]
while m!=0:
    for i in range(0,len(t)-1):
        if f[i]==m:
            print(t[:m])
            exit(0)
    m=f[m-1]
print("Just a legend")