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 maxn = 1000010;
int f[maxn], l, vis[maxn];
char s[maxn];
void getf(char *p) {
  int i, j, n = strlen(p);
  f[0] = f[1] = 0;
  for (i = 1; i < n; i++) {
    j = f[i];
    while (j && p[j] != p[i]) j = f[j];
    f[i + 1] = p[j] == p[i] ? j + 1 : 0;
  }
}
int main() {
  int i, j;
  while (~scanf("%s", s)) {
    l = strlen(s);
    getf(s);
    for (i = 0; i <= f[l]; i++) vis[i] = 0;
    for (i = 1; i < l; i++) vis[f[i]] = 1;
    i = f[l];
    int flag = 0;
    while (i) {
      if (vis[i]) {
        flag = 1;
        s[i] = '\0';
        break;
      }
      i = f[i];
    }
    if (!flag)
      printf("Just a legend\n");
    else
      printf("%s\n", s);
  }
  return 0;
}