Buggy python submission (verdict: Time Limit Exceeded):
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = ""
b2 = ""
if a == 0:
	a2 = "0"
else:
	while True:
		if a % 2 == 0:
			a2 += "0"
		else:
			a2 += "1"
		a = int(a // 2)
		if a == 1:
			a2 += "1"
			break
if b == 0:
	b2 = "0"
else:
	while True:
		if b % 2 == 0:
			b2 += "0"
		else:
			b2 += "1"
		b = int(b // 2)
		if b == 1:
			b2 += "1"
			break

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)


Fixed submission:
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = format(a, "b")
b2 = format(b, "b")
a2 = str(a2[::-1])
b2 = str(b2[::-1])

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)

Buggy python submission (verdict: Time Limit Exceeded):
A, B = list(map(int, input().split()))

ba = B - A 
if A % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if B % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a = A
b = B
a2 = ""
b2 = ""

if a == 0:
	a2 = "0"
else:
	while True:
		if a % 2 == 0:
			a2 += "0"
		else:
			a2 += "1"
		a = int(a // 2)
		if a == 1:
			a2 += "1"
			break
if b == 0:
	b2 = "0"
else:
	while True:
		if b % 2 == 0:
			b2 += "0"
		else:
			b2 += "1"
		b = int(b // 2)
		if b == 1:
			b2 += "1"
			break

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)


Fixed submission:
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = format(a, "b")
b2 = format(b, "b")
a2 = str(a2[::-1])
b2 = str(b2[::-1])

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)

Buggy python submission (verdict: Time Limit Exceeded):
A, B = list(map(int, input().split()))

ba = B - A 
if A % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if B % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a = A
b = B
a2 = ""
b2 = ""

if a == 0:
	a2 = "0"
else:
	while True:
		if a % 2 == 0:
			a2 += "0"
		else:
			a2 += "1"
		a = int(a // 2)
		if a == 1:
			a2 += "1"
			break
if b == 0:
	b2 = "0"
else:
	while True:
		if b % 2 == 0:
			b2 += "0"
		else:
			b2 += "1"
		b = int(b // 2)
		if b == 1:
			b2 += "1"
			break

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1
	else:
		c2 += 0

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1
	else:
		c2 += 0

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 0:
		c2 += 0
	else:
		c2 += 2 ** i

print(c2)


Fixed submission:
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = format(a, "b")
b2 = format(b, "b")
a2 = str(a2[::-1])
b2 = str(b2[::-1])

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)

Buggy python submission (verdict: Time Limit Exceeded):
A, B = list(map(int, input().split()))
if A % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if B % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a = A
b = B
a2 = ""
b2 = ""

if a == 0:
	a2 = "0"
else:
	while True:
		if a % 2 == 0:
			a2 += "0"
		else:
			a2 += "1"
		a = int(a // 2)
		if a == 1:
			a2 += "1"
			break
if b == 0:
	b2 = "0"
else:
	while True:
		if b % 2 == 0:
			b2 += "0"
		else:
			b2 += "1"
		b = int(b // 2)
		if b == 1:
			b2 += "1"
			break

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if (B - A) % 4 == 2 or (B - A) % 4 == 1:
		c2 += 1
	else:
		c2 += 0

if a2[0] == "1":
	if (B - A) % 4 <= 1:
		c2 += 1
	else:
		c2 += 0

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 0:
		c2 += 0
	else:
		c2 += 2 ** i

print(c2)


Fixed submission:
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = format(a, "b")
b2 = format(b, "b")
a2 = str(a2[::-1])
b2 = str(b2[::-1])

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)

Buggy python submission (verdict: Time Limit Exceeded):
A, B = list(map(int, input().split()))

a = A
b = B
a2 = ""
b2 = ""

if a == 0:
	a2 = "0"
else:
	while True:
		if a % 2 == 0:
			a2 += "0"
		else:
			a2 += "1"
		a = int(a // 2)
		if a == 1:
			a2 += "1"
			break
if b == 0:
	b2 = "0"
else:
	while True:
		if b % 2 == 0:
			b2 += "0"
		else:
			b2 += "1"
		b = int(b // 2)
		if b == 1:
			b2 += "1"
			break

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if (B - A) % 4 == 2 or (B - A) % 4 == 1:
		c2 += 1
	else:
		c2 += 0

if a2[0] == "1":
	if (B - A) % 4 <= 1:
		c2 += 1
	else:
		c2 += 0

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if A % 2 == 1:
			n += 1

	if b2[i] == "1":
		if B % 2 == 0:
			n += 1

	if n % 2 == 0:
		c2 += 0
	else:
		c2 += 2 ** i

print(c2)


Fixed submission:
a, b = list(map(int, input().split()))
ba = b - a
if a % 2 == 0:
	ja = "j0"
else:
	ja = "j1"

if b % 2 == 0:
	jb = "j0"
else:
	jb = "j1"

a2 = format(a, "b")
b2 = format(b, "b")
a2 = str(a2[::-1])
b2 = str(b2[::-1])

a2 += "0" * (len(b2) - len(a2))
c2 = 0

if a2[0] == "0":
	if ba % 4 == 2 or ba % 4 == 1:
		c2 += 1

if a2[0] == "1":
	if ba % 4 <= 1:
		c2 += 1

for i in range(1, len(a2)):
	n = 0
	if a2[i] == "1":
		if ja == "j1":
			n += 1

	if b2[i] == "1":
		if jb == "j0":
			n += 1

	if n % 2 == 1:
		c2 += 2 ** i

print(c2)