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:
def KMPSearch(pat, txt):
	M = len(pat)
	N = len(txt)

	lps = [0]*M
	j = 0

	computeLPSArray(pat, M, lps)

	i = 0
	while i < N:
		if pat[j] == txt[i]:
			i += 1
			j += 1

		if j == M:
			print ("Found pattern at index " + str(i-j))
			j = lps[j-1]

		elif i < N and pat[j] != txt[i]:
			if j != 0:
				j = lps[j-1]
			else:
				i += 1

def computeLPSArray(pat, M, lps):
	len = 0

	lps[0]
	i = 1

	while i < M:
		if pat[i]== pat[len]:
			len += 1
			lps[i] = len
			i += 1
		else:
			if len != 0:
				len = lps[len-1]
			else:
				lps[i] = 0
				i += 1
	return lps

s=input()
m=len(s)
lps=[0]*m
x=computeLPSArray(s, m, lps)

x=[0]+x
a=x[-1]
b=x[a]
ans=""

for i in range(len(x)):
    if x[i]==a and i!=m:
        ans=s[0:a]

if ans=="":
    if b!=0:
        ans=s[0:b]
    else:
        ans="Just a legend"
        
print(ans)