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;
int Z[1000010];
int main() {
  char s[1000010];
  scanf("%s", s);
  int L = 0;
  int R = 0;
  int n = strlen(s);
  for (int i = 1; i < n; i++) {
    if (i <= R) Z[i] = min(R - i + 1, Z[i - L]);
    while (i + Z[i] < n && s[Z[i]] == s[i + Z[i]]) Z[i]++;
    if (i + Z[i] - 1 > R && i <= i + Z[i] - 1) {
      L = i;
      R = i + Z[i] - 1;
    }
  }
  int res = 0;
  int maxz = 0;
  for (int i = 1; i < n; i++) {
    if (i + Z[i] == n && maxz >= Z[i]) {
      res = i;
      break;
    }
    maxz = max(maxz, Z[i]);
  }
  if (res == 0)
    cout << "Just a legend";
  else
    for (int i = res; i < n; i++) printf("%c", s[i]);
exit:
  return (0);
}