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 knuthMorrisonPreprocess(pattern , m ):
    fail = [0]*m
    i = 0 
    j= 1
    fail[0]=0
    while(j < m ):
        if pattern[i] == pattern[j]:
            fail[j]= i+1
            i+=1
            j+=1
        elif i > 0:
            i = fail[i-1]
        else:
            j+=1
    return fail

string = input()

n = len(string)
properPrefixArrayL = knuthMorrisonPreprocess(string , n )
properPrefixArray  =properPrefixArrayL[-1]
if properPrefixArray == 0:
	print("Just a legend")
	quit()
for i in range(0,n-1): 
	if properPrefixArrayL[i] == properPrefixArrayL[n-1]:
		print(string[0:properPrefixArrayL[i]])
		quit()
if properPrefixArrayL[properPrefixArrayL[n-1]-1] == 0:
	
	print("Just a legend")
else:
	print(string[0:properPrefixArrayL[properPrefixArrayL[n-1]-1]])