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 maxn = 1e6 + 5;
int Next[maxn];
char mo[maxn];
int n2;
void GetNext() {
  int i = 0, j = -1;
  while (i < n2) {
    if (j == -1 || mo[i] == mo[j]) {
      ++i, ++j, Next[i] = j;
    } else
      j = Next[j];
  }
  return;
}
int vis[maxn];
int main() {
  scanf("%s", mo);
  n2 = strlen(mo);
  Next[0] = -1;
  GetNext();
  int tt = Next[n2];
  while (tt != 0) {
    vis[tt] = 1;
    tt = Next[tt];
  }
  int ans = 0;
  for (int i = 2; i < n2; i++) {
    if (vis[Next[i]]) ans = max(ans, Next[i]);
  }
  if (ans > 0) {
    for (int i = 0; i < ans; i++) printf("%c", mo[i]);
  } else {
    printf("Just a legend");
  }
  return 0;
}