CRC

def crc(data, divisor, mode):
    n = len(divisor)
    dividend = data + ('0' * (n - 1)) if mode == 'sender' else data
    remainder = int(dividend[:n], 2)
    for bit in dividend[n:]:
        remainder = (remainder << 1) | int(bit)
        if remainder & (1 << (n - 1)):
            remainder ^= int(divisor, 2)
    remainder = remainder & ((1 << (n - 1)) - 1)
    return remainder

data = input("Data word (K): ")
divisor = input("Divisor (N): ")
remainder = crc(data, divisor, 'sender')
codeword = data + f'{remainder:0{len(divisor)-1}b}'
print("\nSender Side:\nCodeword (K+N):", codeword)

received = input("\nReceiver Side:\nEnter received Codeword (K+N): ")
remainder = crc(received, divisor, 'receiver')
print("Remainder:", remainder, "\nStatus:", "Accepted" if remainder == 0 else "Discarded")