"""
A, B = map(int, input().split())
if A + B > A * B:
	print("S")
elif A + B < A * B:
	print("P")
else:
	print("E")
"""
import random



def gcd(a, b):
	if a < b:
		a, b = b, a
	if a % b == 0:
		return b
	else:
		return gcd(b, a % b)



#A, B = map(int, input().split())
#print(gcd(A, B))


N = input()
"""
cnt = {}
for c in N:
	if not c in cnt:
		cnt[c] = 1
	else:
		cnt[c] += 1
"""

"""
num = "0123456789"
mn = ""
for n in num:
	if n in cnt:
		for _ in range(cnt[n]):
			mn += n
"""
#print(int(mn))

first = True
for _ in range(1000):
	if first:
		#print("AAA")
		nnn = N
		ans = int(nnn)
		first = False
	else:
		#print("BBB")
		ransu = random.randint(0, len(N)-2)
		if ransu >= 0:
			#print("VCVV")
			#print("N = " + N);
			#print("ransu = " + str(ransu))
			#nn = N[0:ransu-1] + N[ransu+1:ransu+1] + N[ransu:ransu] + N[ransu+2:-1]
			if ransu == 0:
				nn = N[ransu+1] + N[ransu] + N[ransu+2:-1]
			if ransu == 1:
				nn = N[0] + N[ransu+1] + N[ransu] + N[ransu+2:-1]
			else:
				nn = N[0:ransu-1] + N[ransu+1] + N[ransu] + N[ransu+2:-1]
			#print("aaa" + nn + "aaa")
			ans = gcd(ans, int(nn))

print(ans)