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 fun(pat, M, lps):
    tmp = 0

    lps[0] = 0

    i = 1;
    while (i < M):
        if (pat[i] == pat[tmp]):
            tmp += 1
            lps[i] = tmp
            i += 1
        else:
            if (tmp != 0):
                tmp = lps[tmp-1];
            else:
                lps[i] = 0
                i += 1
r=raw_input().strip()
n=len(r)
if n<3:
    print "Just a legend"
    exit()
arr=[0]*n
fun(r,n,arr)
#print arr
f=0
if arr[-1]==0:
    print "Just a legend"
    exit()
for i in range(1,n-1):
    if arr[i]==arr[-1]:
        print r[:arr[-1]]
        exit()

if arr[arr[-1]-1]==0:
    print "Just a legend"
    exit()

print r[:arr[arr[-1]-1]]

    
    
