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
'''input
ghghghgxghghghg
'''
# KMP prefix structure
from sys import stdin


def prefix_calculator(string):
	p = [0] * len(string)
	j = 0
	for i in range(1, len(string)):
		while j > 0 and string[i] != string[j]:
			j = p[j - 1]

		if string[i] == string[j]:
			j += 1
		p[i] = j
		
	return p


# main starts
string = stdin.readline().strip()
if len(string) <= 2:
	print('Just a legend')
	exit()
p = prefix_calculator(string)
#print(p)
if p[-1] == 0:
	print("Just a legend")

else:	
	for i in range(1, len(p) - 1):
		if p[i] == p[-1]:
			print(string[0 : p[-1]])
			break
	else:
		if p[p[-1] - 1] != 0:
			print(string[0: p[p[-1] - 1]])
		else:
			print("Just a legend")
