# Define the data blocks as integers (binary values)
D1 = int('1010', 2)
D2 = int('1100', 2)
D3 = int('0110', 2)
D4 = int('1001', 2)

# Perform XOR on all data blocks
parity = D1 ^ D2 ^ D3 ^ D4

# Convert the result back to binary string
parity_binary = bin(parity)[2:]  # [2:] removes the '0b' prefix

print(f"Parity: {parity_binary}")