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 CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int maxC = 2147483647;
const int maxNode = 10230997;
const int maxN = 1000000;
string str;
int n, z[maxN];
void buildZ(string& str) {
  z[0] = 0;
  int l = 0;
  for (int i = 1; i < (int)str.size(); ++i) {
    while (l && str[i] != str[l]) l = z[l - 1];
    if (str[i] == str[l]) ++l;
    z[i] = l;
  }
}
int main() {
  cin >> str;
  buildZ(str);
  int res = z[str.size() - 1];
  bool kt = 0;
  for (int i = 0; i < (int)str.size() - 1; ++i) {
    if (z[i] == res) {
      kt = 1;
      break;
    }
  }
  if (!kt) {
    res = z[res - 1];
  }
  if (res == 0)
    cout << "Just a legend";
  else
    cout << str.substr(0, res);
  return (0);
}