a = input()
b = input()
# ands = ""
# ors = ""
xors = ""
while (len(a) > len(b)):
    b = "0" + b
while (len(a) < len(b)):
    a = "0" + a
for i in range(len(a)):
    if (a[i] == "0" and b[i] == "0"):
        # ands += "0"
        # ors += "0"
        xors += "0"
    if ((a[i] == "1" and b[i] == "0") or (a[i] == "0" and b[i] == "1")):
        # ands += "0"
        # ors += "1"
        xors += "1"
    if (a[i] == "1" and b[i] == "1"):
        # ands += "1"
        # ors += "1"
        xors += "0"
print(a)
print(b)
print(xors)