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;
char s[1000005];
int Next[1000005];
bool vis[1000005];
int len;
void getnext() {
  Next[0] = -1;
  int j = -1, i = 0;
  while (i < len) {
    if (j == -1 || s[i] == s[j]) {
      i++;
      j++;
      Next[i] = j;
    } else {
      j = Next[j];
    }
  }
}
int main() {
  scanf("%s", s);
  len = strlen(s);
  getnext();
  for (int i = 1; i < len; i++) vis[Next[i]] = 1;
  int i = Next[len];
  while (i) {
    if (vis[i]) {
      for (int j = 0; j < i; j++) cout << s[j];
      cout << endl;
      break;
    } else
      i = Next[i];
  }
  if (i == 0) cout << "Just a legend" << endl;
  return 0;
}