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
def prefix(lsa,n):
    index=0
    i=1
    while i<n:
        if s[i]==s[index]:
            lsa[i]=index+1
            i+=1
            index+=1
        else:
            if index==0:
                lsa[i]=0
                i+=1
            else:
                index = lsa[index-1]
                     
s = input()
n = len(s)
lsa=[0]*(n)
prefix(lsa,n)
#print(lsa)
if lsa[-1]==0:
    print("Just a legend")
else:
    for i in range(n-1):
        if lsa[i]==lsa[-1]:
            print(s[:lsa[i]])
            exit()
    if(lsa[lsa[-1]-1]==0):
        print("Just a legend")
    else:
        print(s[:lsa[lsa[-1]-1]])

    
