def main():
    shift = (ord('C') - ord('y')) % 26

    ctext = "XVIEWYWI"
    plaintext = ""

    for char in ctext:
        if char.isalpha():
            shifted = ord(char.lower()) - shift
            if shifted < ord('a'):
                shifted += 26
            plaintext += chr(shifted)
        else:
            plaintext += char

    print(f"Attack type: Known plaintext attack")
    print(f"Ciphertext: {ctext}")
    print(f"Decrypted: {plaintext}")

if __name__ == '__main__':
    main()