a, b = input().split()
print(bin(int(a, 2) + int(b, 2))[2:])
for i in range(4 - len(bin(int(a, 2) & int(b, 2))[2:])):
    print("0", end="")
print(bin(int(a, 2) & int(b, 2))[2:])

#code by Luthics