PLEASE HELP ME FIX THIS CODES FOR THIS PROBLEMSProblem $1$:

Complete the function affine$\_$encrypt$($text$,$ a$,$ b$)$ that returns the cipher text encrypted

using key $(a,b).$ You must verify that the $gcd(a,26)=1$ before making the encryption. If

$gcd(a,26)1,$ the function must raise a ValueError exception with message "The

given key is invalid." $.$

def affine$\_$encrypt$($text$,a,b$ :

$"""$

encrypts the plaintext 'text', using an affine transformation key $(a,b$

:param: text $-$ str type; plaintext as a string of letters

:param: a $-$ int type; integer satisfying $gcd(a,26)=1$

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CECS $229$ Programming Assignment #$3$

:param: b $-$ int type; shift value

: raise: ValueError if $gcd(a,26)$ is not $1.$

:return: str type; the encrypted message as string of uppercase letters

n nn

# FIXME: raise an error if the $gcd(a,26)$ is not $1$

cipher $="$

for letter in text:

if letter.isalpha$()$:

# FIXME: Use

util.py to initialize 'num' to be

# the integer corresponding to the current letter

num $=$ None

# FIXME: Encrypt the current 'num' using the

# affine transformation with key $(a,b).$

# Store the result in cipher$\_$digits.

cipher$\_$digits $=$ "None"

if len$($cipher$\_$digits$)==1$ :

# FIXME: If the cipherdigit is $0-9,$

# prepend the string with $a$

# to make it a two$-$digit number

cipher$\_$digits $=$ None

# FIXME: Use

util.py to append to the cipher the ENCRYPTED letter

# corresponding to the current cipher digits

cipher $+=$ 'None"

return cipher