PLEASE WRITE IN PYTHON

USING JUPYTER NOTEBOOK

Create a function affineDecrypt (ciphertext, a,b ) that returns the cipher text encrypted using key (a,b). You must verify that the gcd(a,26)=1. If this is not the case, the function must raise ValueError with message "The given key is invalid. The gcd (a,26) must be 1." . You may NOT use any built-in functions as part of your implementation, but you may use any functions you implemented in previous coding assignments. Please make sure to copy and paste them into this file, so that they are uploaded to CodePost when you submit your pa3.py file. def affinedecrypt (ciphertext, a,b) : "" "decrypts the string 'ciphertext', which was encrypted using an affine transforma INPUT : ciphertext - a string of encrypted letters a - integer satisfying gcd (a,26)=1. b - integer ouTPUT: The decrypted message as a string of characters "" pass