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 NMAX = 1e6 + 7;
int n, vis[NMAX];
char s[NMAX];
struct LPS {
  int lps[NMAX];
  void build() {
    int i = 0, len = -1;
    lps[i] = len;
    while (i < n) {
      while (len >= 0 && s[i] != s[len]) len = lps[len];
      i++, len++;
      lps[i] = len;
    }
  }
} L;
int main() {
  scanf("%s", s);
  n = strlen(s);
  L.build();
  for (int i = 1; i <= n - 1; i++) vis[L.lps[i]] = 1;
  int go = L.lps[n];
  int res;
  for (; go != 0; go = L.lps[go])
    if (vis[go]) {
      res = go;
      break;
    }
  if (go == 0)
    printf("Just a legend\n") * 0;
  else
    for (int i = 0; i < res; i++) printf("%c", s[i]);
  return 0;
}