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
# You lost the game.
def border(s):
    dic={}
    j=-1
    dic[0]=-1
    for i in range(1,len(s)+1):
        while j!=-1 and s[i-1]!=s[j]:
            j=dic[j]
        j+=1
        dic[i]=j
    return dic
s=raw_input()
pre=border(s)
check={i:0 for i in range(-1,len(s))}
for i in pre:
    check[pre[i]]+=1
ans=pre[len(s)]
if check[ans]<2:
    ans=pre[ans]
    while ans!=0 and check[ans]==0:
        ans=pre[ans]
if ans<=0:
    print 'Just a legend'
else:
    print s[:ans]
