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 maxn = 1000003;
char a[maxn];
int nxt[maxn], n, maxx;
void getnext() {
  for (int i = 2, j = 0; i <= n; ++i) {
    while (j && a[i] != a[j + 1]) j = nxt[j];
    if (a[i] == a[j + 1]) ++j;
    nxt[i] = j;
    if (i != n) maxx = max(nxt[i], maxx);
  }
}
int main() {
  scanf("%s", a + 1), n = strlen(a + 1), getnext();
  int x = nxt[n];
  while (x > maxx) x = nxt[x];
  if (!x) return puts("Just a legend"), 0;
  for (int i = 2; i < n; ++i)
    if (x == nxt[i]) {
      for (int j = i - nxt[i] + 1; j <= i; ++j) cout << a[j];
      break;
    }
  return 0;
}