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.

You are given the string s whose length can vary from $1$ to $10^6$ (inclusive), consisting of small Latin letters.

Print the string $t$. If a suitable $t$ string does not exist, then print "Just a legend" without the quotes.