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 PYTHON):

Solution:
import sys

def lpsF(tab):
    #lps = [0]*len(tab)
    lps = []
    j = 0
    lps.insert(0,0);
    i = 1
    while i < len(tab)-1:
        if(tab[i] == tab[j]):
            lps.insert(i,j+1)
            #lps[i] = j+1
            i = i+1
            j = j+1
        else:
            if(j!=0):
                j = lps[j-1]
            else:
                lps.insert(i,0)
                i = i+1
    return(lps)

t = str(next(sys.stdin))
lps = lpsF(t)
#print(lps)

n = len(lps)
sec = lps[n-1]
thir = lps[sec-1]

#print(sec)
#print(lps)


if(sec == 0):
    print("Just a legend")
elif(sec != 0 and sec in lps[0:n-2]):
    print(t[0:sec])
elif(thir != 0):
    print(t[0:thir])
else :
   print("Just a legend")