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:
from sys import stdin,stdout,stderr
def lcp(string):
    l=len(string)
    lis=[0]*l
    j=1
    k=0
    while j<l:
        if string[j]==string[k]:
            lis[j]=k+1
            j+=1
            k+=1
        elif k>0:
            k=lis[k-1]
        else :j+=1
    return lis
string=input()

lis=lcp(string)

if lis[-1]==0:
    print("Just a legend")
    exit()
for i in range(len(string)-1):
    if lis[i]!=0 and lis[i]==lis[-1]:
        print(string[:lis[-1]])
        exit()
l=lis[-1]
if l==0:
    print("Just a legend")
    exit()
l=lis[lis[-1]-1]
if l:
    print(string[:l])
    exit()
print("Just a legend")