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 long long int maxn = 1000010;
char p[maxn];
long long int f[maxn];
long long int n;
int main() {
  scanf(" %s", p);
  n = strlen(p);
  f[0] = -1;
  long long int j = -1, i = 0;
  while (i <= n) {
    while (j >= 0 && p[i] != p[j]) j = f[j];
    j++;
    i++;
    f[i] = j;
  }
  set<long long int> s;
  long long int k = f[n];
  for (long long int l = 1; l < n - 1; l++) {
    s.insert(f[l + 1]);
  }
  j = k;
  while (j >= 0) {
    if (s.find(j) != s.end()) {
      break;
    } else {
      j = f[j];
    }
  }
  if (j == -1 || j == 0) {
    printf("Just a legend\n");
  } else {
    printf("%s\n", string(p).substr(0, j).c_str());
  }
}