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 inf = 0x3f3f3f3f;
const int N = 1e6 + 100;
int n;
char s[N];
int nx[N];
bool vis[N];
void getnext() {
  nx[0] = -1;
  int i = 0, j = -1;
  while (i < n) {
    if (j == -1 || s[i] == s[j])
      nx[++i] = ++j;
    else
      j = nx[j];
  }
}
int main() {
  scanf("%s", s);
  n = strlen(s);
  getnext();
  for (int i = 1; i < n; i++) vis[nx[i]] = true;
  int ans = nx[n];
  while (!vis[ans] && ans) ans = nx[ans];
  if (ans == 0)
    printf("Just a legend\n");
  else {
    for (int i = 0; i < ans; i++) putchar(s[i]);
    putchar('\n');
  }
  return 0;
}