n1 = input()
n2 = input()
arr = []
for i in range(len(n1)):
	if n1[i] == n2[i]:
		arr.append('0')
	else:
		arr.append('1')
print("".join(arr))
3a08c8049db3760bd7b233eeb411627d3266328e
<mask token>

<mask token>
for i in range(len(n1)):
    if n1[i] == n2[i]:
        arr.append('0')
    else:
        arr.append('1')
print(''.join(arr))

n1 = input()
n2 = input()
arr = []
for i in range(len(n1)):
    if n1[i] == n2[i]:
        arr.append('0')
    else:
        arr.append('1')
print(''.join(arr))

n1 = input()
n2 = input()
arr = []
for i in range(len(n1)):
	if n1[i] == n2[i]:
		arr.append('0')
	else:
		arr.append('1')
print("".join(arr))