Please help writting a code using C++ ONLY. Please show the steps and comment thanks in advance

Let K be a fixed element of Z26, and define the fixed permutation over Z26 as 0 1 2 3 45 6 789 10 11 12 13 14 15 16 17 18 19 20 21 2223 24 25 23 13 24 0 7 15 14 6 25 16 22 1 19 18 5 11 17 2 21 12 20 4 10 9 3 8 Consider the stream cipher with the key stream element zi e z26, where zi = (K+1 decryption using are done as follows: 1) mod 26, Encryption and e: (z) = (n(x) + 2) mod 26, d, (y) = (-1( y-z)mod 26 ). Write a C/C++ program streamCipher to decrypt the following ciphertext which was encrypted by the above stream cipher W RTCN RLDSAFARWKXFTXCZRNHNYPDTZUUKMPLUSOXNEU DOKLXRMCBKGRCCURR Your program should use brute force attack and stop when the user is satisfied with the result. (submit the plaintert, your code, and instructions on how to test it)