From a Vignere cipher, please complete the following Python code to return the key used to encrypt a message. Verify that it works with messages encrypted with the following keys: ucla, ece, ijl, gubf, chxbz, xlmviu

from collections import Counter

# This function returns the

# encrypted text generated

# with the help of the key

def cipherText(string, key):

cipher_text = []

for i in range(len(string)):

x = (ord(string[i]) +

ord(key[i])) % 26

x += ord('A')

cipher_text.append(chr(x))

return("" . join(cipher_text))

# This function decrypts the

# encrypted text and returns

# the original text

def originalText(cipher_text, key):

orig_text = []

for i in range(len(cipher_text)):

x = (ord(cipher_text[i]) -

ord(key[i]) + 26) % 26

x += ord('A')

orig_text.append(chr(x))

return("" . join(orig_text))

# This method can be used to calculate the Index of Coincidence.

# Note that a text written in English language has an index of coincidence of 0.0667

def IoC(self, text):

text_length = 0

letterCounts = Counter(text)

total = 0

for ni in letterCounts.values():

total += ni * (ni-1)

text_length += ni

if text_length == 0:

return 0

else:

return total / (text_length * (text_length-1))

#please complete this method using the IoC function

def getKey(self, ciphertext) -> str: