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:
import sys
input=sys.stdin.readline
import collections as cc
s=input().strip()
n=len(s)
temp=cc.Counter(s)
pre=[0]*(n)
i=1
j=0
lst=-1
while i<n:
	if(s[i]==s[j]):
		j+=1
		pre[i]=j
		i+=1
	else:
		if j:
			j=pre[j-1]
		else:
			pre[i]=0
			i+=1
pre[0]=0
#print(pre)
temp=pre[-1]
if pre[-1]!=0 and pre.count(temp)>=2:
	print(''.join(s[:temp]))
elif pre[-1]!=0 and pre[pre[-1]-1]>0:
	print(''.join(s[:pre[pre[-1]-1]]))
else:
	print('Just a legend')