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 PYTHON3):

Solution:
maxZ = pos = 0

def ZFunction(S) :
	L = R = 0
	N = len(S)
	Z = [0] * N
	Z[0] = N
	for i in range (1, N) :
		if i > R :
			L = R = i
			while R < N and S[R] == S[R - L] :
				R += 1
			Z[i] = R - L
			R -= 1
		else :
			k = i - L
			if Z[k] < R - i + 1 :
				Z[i] = Z[k]
			else :
				L = i
				while R < N and S[R] == S[R - L] :
					R += 1
				Z[i] = R - L
				R -= 1
	return Z

if __name__ == "__main__" :
	S = input()
	N = len(S)
	Z = ZFunction(S)
	for i in range (1, N) :
		if Z[i] == N - i and maxZ >= N - i :
			pos = N - i
			break
		maxZ = max(maxZ, Z[i])
	if pos == 0 :
		print("Just a legend")
	else :
		print(S[:pos])