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 Zarr(pat,text):
    s=pat+"/"+text;
    z=[0 for i in range(len(s))]
    L=0;R=0;n=len(s);
    for i in range(1,len(s)):
        if i>R:
            L=R=i
            while R<n and s[R-L]==s[R]:
                R+=1
            z[i]=R-L
            R-=1
        elif z[i-L]+i<=R:
            z[i]=z[i-L]
        else:
            L=i
            while R<n and s[R-L]==s[R]:
                R+=1
            z[i]=R-L
            R-=1
    dp=[0 for i in range(1000006)]
    ans=-1
    for i in range(len(pat)+2,len(s)):
        dp[z[i]]+=1
    for i in range(len(dp)-2,-1,-1):
        dp[i]+=dp[i+1]
    for i in range(len(pat)+2,len(s)):
        if i+z[i]==len(s) and dp[z[i]]>1 and z[i]>ans:
            ans=z[i]
    if ans==-1:
        print("Just a legend")
    else:
        print(pat[0:ans])

from sys import stdin
texts=stdin.readline().strip()
Zarr(texts,texts)
