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 JAVA):

Solution:
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    public class C {
        public static int test(String line) {
            long beginHash[] = new long[line.length()];
            long endHash[]  = new long[line.length()];
            long pow[] = new long[line.length()];
            long mod = 10000007L;
            beginHash[0]= line.charAt(0);
            pow[0] =1;
            endHash[line.length() - 1] = line.charAt(line.length() - 1);
            int ans = 0;
            for (int i = 1; i < line.length() - 1; i ++) {
                pow[i] = pow[i -1] * 256%mod;
                int k = line.length() - i - 1;
                beginHash[i] = beginHash[i-1] * 256 + line.charAt(i);
                endHash[k] = endHash[k+1] +  line.charAt(k) * pow[i];
                beginHash[i] = (beginHash[i] % mod + mod ) % mod;
                endHash[k] = (endHash[k] % mod + mod) % mod;
               
            }
            for (int i = line.length() - 2; i >= 0; i --) {
               
                if (beginHash[i] == endHash[line.length() - i - 1]) {
    //                System.out.println("in : " + i);
                    long hash = beginHash[i];
                   
                   
                    for (int j = 1; j + i <line.length() -1 ; j ++) {
                        hash = hash - line.charAt(j-1)*pow[i];
                        hash = hash * 256 + line.charAt(j + i );
                        hash = (hash % mod + mod) % mod;
                       
                        if (hash == beginHash[i]) {
                            int k;
                            for (k = 0 ; k <= i ; k ++) {
                                if (line.charAt(k) != line.charAt(j + k)) break;
                                if (line.charAt(k) != line.charAt(line.length()  - i - 1 + k )) break;
                            }
                            if (k== i + 1) {
                                ans = i + 1;
                                return ans;
                            }
                        }
                    }
                }
                 
            }
            return ans;
               
        }
        public static void main(String[] args) throws IOException {
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
            String line = bufferedReader.readLine();
            int ans = test(line);
            if (ans == 0) System.out.println("Just a legend");
            else System.out.println(line.substring(0,ans));
        }

    }